Tsukuba & Kashima Coast Local Quiz Practice: Questions and Explanations

Pixel-art imaginary science-town skyline with a lake motif
40QEasyIntermediateAdvanced

Review questions from the real quiz with answers, explanations and sources. Think it through first, then reveal the correct answer.

This is a selection from the question pool — the real quiz also draws questions you won’t find here.

Last updated: 2026-09-14

EasyTier 1 — 10 questions

On the same map, a rocket research center sits within reach of a shrine legend centuries old -- that contrast is what makes Tsukuba and the Kashima coast worth quizzing. These first ten questions cover the names that come up whenever this area is described: twin-peaked Mt. Tsukuba, the origins of the space center and the university, the memory of the 1985 Science Expo, the giant bronze Buddha at Ushiku, the legend behind a stone at Kashima Shrine, the region's beloved football club, its fireworks and iris festivals, and its status as Japan's top melon country. Clear all ten and you already have the outline of the area. Every answer comes with its source attached.

Q1.Mt. Tsukuba's summit is known as a twin-peaked mountain, with 'Nantai-san' being one peak. What is the name of the other peak?

  1. Nyotai-san
  2. Miyuki-san
  3. Chuzenji-san
  4. Kaba-san
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Correct answerNyotai-san

Mt. Tsukuba has two peaks, Nantai-san (871m) to the west and Nyotai-san (877m) to the east, and is often called 'Fuji in the west, Tsukuba in the east,' the Kanto Plain's own great mountain. It is the lowest peak on the '100 Famous Mountains' list, though compiler Kyuya Fukada is said to have valued its historical and cultural weight over elevation when selecting it.

Source:Mount Tsukuba - Wikipedia

Q2.The JAXA Tsukuba Space Center has training facilities for astronauts.

  1. True
  2. False
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Correct answerTrue

Astronaut training related to the operation of Kibo, Japan's experiment module on the International Space Station, is conducted at the Tsukuba Space Center. Established in 1972, the center has long served as the core hub supporting Japan's space program, from rocket development to astronaut training.

Source:JAXA | Tsukuba Space Center

Q3.Which university was the predecessor of the University of Tsukuba?

  1. Tokyo University of Education
  2. University of Tokyo
  3. Ibaraki University
  4. Ochanomizu University
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Correct answerTokyo University of Education

The University of Tsukuba opened in 1973 based on the Tokyo University of Education, and is regarded as Japan's first university built on a 'new concept' model. Among its defining features was a distinctive gakugun/gakurui (college/major) structure in place of the traditional faculty-department system; the predecessor institution itself continued to operate for some years afterward.

Source:History - University of Tsukuba

Q4.What international exposition, with 48 participating countries, was held in Tsukuba City in 1985?

  1. the Tokyo Olympics
  2. Expo '85 Tsukuba
  3. the Osaka World Expo
  4. a G7 summit
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Correct answerExpo '85 Tsukuba

Officially named the International Exposition on Science and Technology, Expo '85 ran for 184 days from March to September 1985 in Tsukuba Science City, with 48 countries and 37 international organizations taking part. It set a record for total attendance among specialized (non-registered) world expositions at the time, and in later years a sealed time capsule stuffed with visitors' letters -- 'Post Capsule 2001' -- was buried at the site for future opening.

Source:International Exposition on Science and Technology - Wikipedia

Q5.The Tsuchiura National Fireworks Competition, one of Japan's 'Three Great Fireworks Displays,' is typically held around what time of year?

  1. autumn (November)
  2. summer (August)
  3. winter (January)
  4. spring (April)
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Correct answerautumn (November)

The Tsuchiura National Fireworks Competition is held every year on the first Saturday of November, and is considered one of Japan's three great fireworks displays, alongside Omagari in Akita and Nagaoka in Niigata. Begun in 1925, the competition now spans nearly a century of history, with pyrotechnicians competing across several divisions, including star mine displays and giant shakudama shells.

Source:Tsuchiura National Fireworks Competition | Tsuchiura City Official Site

Q6.What is the total height of the Ushiku Daibutsu, including its pedestal?

  1. 80m
  2. 120m
  3. 100m
  4. 150m
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Correct answer120m

The Ushiku Daibutsu's total height, including its pedestal, is 120m, making it one of the tallest bronze statues in the world. The statue itself accounts for 100m of that height, with the remaining 20m made up by its pedestal, and since its completion in 1993 it has become Ushiku City's best-known tourist landmark.

Source:Overview of the Ushiku Daibutsu

Q7.The 'kaname-ishi' (keystone) at Kashima Shrine is said, in legend, to hold down the head of a giant catfish believed to cause earthquakes.

  1. True
  2. False
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Correct answerTrue

After the 1855 Ansei Great Earthquake, talismans known as 'namazu-e' (catfish prints), referencing the legend that the kaname-ishi holds down the head of a giant catfish believed to cause earthquakes, became popular in Edo, spreading awareness of the stone. Only a small portion is visible above ground; most of it is said to remain buried.

Source:Kaname-ishi - Wikipedia

Q8.Which J-League club has Kashima City as its home town?

  1. Mito HollyHock
  2. Kashima Antlers
  3. Kashiwa Reysol
  4. Omiya Ardija
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Correct answerKashima Antlers

Kashima Antlers was founded in 1991 based on the Sumitomo Metal Industries soccer team, with Kashima City and Kamisu City among its home towns. As one of the J.League's 'Original 10' clubs from its 1993 launch, it is also one of only two clubs that have never been relegated to J2.

Source:Club Profile | Kashima Antlers Official Site

Q9.What festival is held in Itako City's water-town district, timed to the blooming of Japanese iris, hanashobu, and kakitsubata?

  1. Chrysanthemum Festival
  2. Cherry Blossom Festival
  3. Sunflower Festival
  4. Iris Festival (Ayame Matsuri)
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Correct answerIris Festival (Ayame Matsuri)

The Suigo Itako Iris Festival showcases Japanese iris, hanashobu, and kakitsubata in bloom, and is a signature festival for the region. What began as a small informal gathering among enthusiasts has grown into an event that draws large crowds each year from late May through late June, now standing as the emblem of early summer in Itako.

Source:Notice of the Suigo Itako Iris Festival

Q10.What fruit has Hokota City long led Japan in producing?

  1. melons
  2. strawberries
  3. grapes
  4. mandarin oranges
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Correct answermelons

Hokota City takes advantage of its mild climate and well-drained soil to remain Japan's top melon-producing area for many years running. Cultivation expanded after the introduction of the Prince Melon variety, and the city now also produces original premium brands such as 'Ibaraking,' anchoring Ibaraki Prefecture's reputation as one of Japan's great melon kingdoms.

Source:Welcome to Japan's No. 1 Fruit & Vegetable Kingdom – Hokota Tourism Association

IntermediateTier 2 — 15 questions

Even residents of Tsukuba and the Kashima coast may hesitate on the next fifteen: a robotics venture you can bump into inside an ordinary shopping mall, where Lake Kasumigaura actually ranks among Japan's lakes, why Tsuchiura Castle carries the nickname of a floating turtle, and what shape Kashima Port was excavated into. These questions gather the numbers and origins hidden in the region's geography, industry, and history -- the kind of detail no guidebook spells out, and that only comes from actually living here.

Q11.What is the name of the wearable robot, developed and researched at 'CYBERDYNE STUDIO' inside iias Tsukuba, that assists the body's movements when worn?

  1. HAL
  2. ASIMO
  3. Pepper
  4. AIBO
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Correct answerHAL

iias Tsukuba houses 'CYBERDYNE STUDIO,' run by CYBERDYNE Inc., the company behind the HAL robot suit used for nursing care and mobility support. CYBERDYNE is known as a venture spun out of the University of Tsukuba, giving shoppers at an everyday mall a hands-on brush with the kind of cutting-edge technology this science city is known for.

Source:Iiasつくば - Wikipedia (Japanese)

Q12.Roughly how many visitors attend Tsukuba City's largest festival, 'Matsuri Tsukuba,' in a typical year?

  1. About 40,000
  2. About 200,000
  3. About 400,000
  4. About 800,000
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Correct answerAbout 400,000

Started in 1981, Matsuri Tsukuba is Tsukuba City's signature festival, drawing more than 400,000 visitors most years. Thanks to the city's many international residents, food stalls representing cuisines from around the world are also a popular feature, and its parade includes giant nebuta floats said to be Japan's second-largest such display after the original in Aomori.

Source:まつりつくば - Wikipedia (Japanese)

Q13.Roughly how many total visitors attended the 1985 International Science and Technology Exposition (Tsukuba Expo '85)?

  1. About 5 million
  2. About 10 million
  3. About 20 million
  4. About 30 million
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Correct answerAbout 20 million

Over its 184-day run, Tsukuba Expo '85 drew about 20.33 million visitors, a record at the time for a specialized (non-registered) world exposition. Its unifying theme was 'Dwellings and Surroundings: Science and Technology for Man at Home,' and the fairgrounds in Tsukuba Science City were lined with pavilions from numerous companies and nations.

Source:国際科学技術博覧会 - Wikipedia (Japanese)

Q14.Which station is the starting point of the Tsukuba Express?

  1. Tokyo Station
  2. Ueno Station
  3. Nippori Station
  4. Akihabara Station
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Correct answerAkihabara Station

The Tsukuba Express starts at Akihabara Station and runs about 58km to Tsukuba Station. Since it opened in August 2005, its fastest service of just 45 minutes between central Tokyo and Tsukuba has driven major housing and commercial development along the line.

Source:Company History | Metropolitan Intercity Railway Company

Q15.By surface area, how does Lake Kasumigaura rank among Japan's lakes?

  1. 1st largest
  2. 2nd largest
  3. 3rd largest
  4. 5th largest
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Correct answer2nd largest

Lake Kasumigaura ranks as Japan's second-largest lake by surface area, after Lake Biwa. Fed by numerous rivers of varying size, including the Sakura and Koise, it is a freshwater rather than brackish lake, long supporting local fishing and tourist boat operations.

Source:霞ヶ浦 - Wikipedia (Japanese)

Q16.What is the alternative name of Tsuchiura Castle?

  1. Crane Castle
  2. Dragon Castle
  3. Cloud Castle
  4. Turtle Castle
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Correct answerTurtle Castle

Tsuchiura Castle was a flatland castle protected by multiple layers of water moats, and its appearance -- like a turtle floating on the water -- earned it the nickname "Kijo" (Turtle Castle). No tenshu (main keep) was ever built there throughout the Edo period, and its surviving Taiko-mon gate still conveys the look of the castle in its heyday.

Source:土浦城 - Wikipedia (Japanese)

Q17.Roughly what share of Japan's total lotus root shipments does Ibaraki Prefecture account for?

  1. About 50%
  2. About 20%
  3. About 35%
  4. About 70%
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Correct answerAbout 50%

Ibaraki Prefecture leads the nation in both lotus root planted area and shipment volume, accounting for roughly 50% of Japan's total shipments (about 50.2% in the FY2022 crop year). Cultivation is centered around Tsuchiura City along the shores of Lake Kasumigaura, with the harvest peaking from late autumn into winter.

Source:Regional Specialty Vegetable Production Survey | ALIC Vegetable Information System

Q18.For what category was the Ushiku Daibutsu recognized as the world's largest when it entered the Guinness World Records in 1995?

  1. Stone statue of Buddha
  2. Wooden building
  3. Bronze statue of Buddha
  4. Standing statue of any kind
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Correct answerBronze statue of Buddha

While it ranks sixth in height among standing statues worldwide, the Ushiku Daibutsu is recognized by Guinness World Records as the world's largest bronze statue of Buddha. Earning that title in 1995 helped establish the statue as Ushiku City's best-known tourist draw, both domestically and abroad.

Source:牛久大仏 - Wikipedia (Japanese)

Q19.What was Ushiku Chateau Japan's first example of?

  1. Beer brewery
  2. Whisky distillery
  3. Silk-reeling mill
  4. Full-scale winery
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Correct answerFull-scale winery

Ushiku Chateau, using French grape varieties and Bordeaux-style winemaking methods, is regarded as Japan's first full-scale winery. Its founder, businessman Denbei Kamiya, is also known for creating the signature cocktail 'Denki Bran' at 'Kamiya Bar' in Asakusa.

Source:History of Ushiku Chateau | Ushiku Chateau Official Site

Q20.What rank did Kashima Shrine hold in the old province of Hitachi?

  1. Sosha (general shrine)
  2. Ninomiya (second shrine)
  3. Sannomiya (third shrine)
  4. Ichinomiya (first/highest shrine)
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Correct answerIchinomiya (first/highest shrine)

Kashima Shrine holds the rank of "Ichinomiya of Hitachi Province," making it the highest-ranked shrine in the region. Its prestigious rank was also recorded in the Heian-era Engishiki, reflecting its long-standing status as one of eastern Japan's most revered shrines.

Source:About Kashima Jingu | Kashima Jingu Official Site

Q21.What title did Kashima Antlers win in 1993, the founding year of the J-League?

  1. Emperor's Cup champion
  2. Overall season champion
  3. Nabisco Cup champion
  4. Suntory Series (1st stage) champion
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Correct answerSuntory Series (1st stage) champion

In the J-League's inaugural year, which kicked off in May 1993, Kashima Antlers won the Suntory Series (first stage) title. Its predecessor, the Sumitomo Metal Industries team, had been competing at a second-tier level at the time, yet it was still chosen as one of the league's founding 'Original 10' clubs.

Source:1993年の鹿島アントラーズ - Wikipedia (Japanese)

Q22.What kind of harbor structure forms the core of the Kashima industrial coastal zone?

  1. A harbor built using a natural inlet
  2. A harbor built directly at a river mouth
  3. An excavated (dug-out) artificial harbor
  4. A harbor made entirely from reclaimed land
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Correct answerAn excavated (dug-out) artificial harbor

Kashima Port is an excavated artificial harbor, dug out of the sand dune area between the Kashima coast and Lake Kitaura, and is one of the largest excavated harbors in the world. Steel and petrochemical heavy industries clustered around the port, and it became the centerpiece of the 'Kashima Development' project that transformed the once-inland Kashima and Kamisu area into a major industrial zone.

Source:鹿島臨海工業地帯 - Wikipedia (Japanese)

Q23.When is the Suigo Itako Iris Festival held?

  1. March to April
  2. Late May through late June
  3. August
  4. November
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Correct answerLate May through late June

The Suigo Itako Iris Festival is held every year from late May through late June, typically reaching peak bloom around June 10th. About 500 varieties and roughly 1 million iris, hanashobu, and kakitsubata plants bloom across the grounds, drawing visitors who often pair the flowers with a boat tour along the canals.

Source:Suigo Itako Iris Festival | Itako City Official Site

Q24.As of FY2023, where does Hokota City rank nationally in the "vegetables" category of municipal agricultural output?

  1. 1st nationally
  2. 5th nationally
  3. 10th nationally
  4. 20th nationally
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Correct answer1st nationally

Hokota City ranks 1st nationally in the vegetables category of municipal agricultural output (about 35.8 billion yen, as of FY2023), reflecting its status as a major producer of melons and other diverse crops. Its mild climate and well-drained soil underpin the cultivation of melons and a wide range of other vegetables.

Source:Municipal Agricultural Output (Estimates) | Ministry of Agriculture, Forestry and Fisheries

Q25.Tsukubamirai City was formed through the merger of Ina Town with which village?

  1. Mitsukaido City
  2. Yawara Village
  3. Ina Village
  4. Makabe Town
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Correct answerYawara Village

Tsukubamirai City was formed in 2006 through the merger of Ina Town and Yawara Village, both formerly of Tsukuba District. Its name combines the old district name 'Tsukuba' with 'Mirai-daira,' the name of a Tsukuba Express station, and as of now it is the most recently incorporated city in Ibaraki Prefecture.

Source:つくばみらい市 - Wikipedia (Japanese)

AdvancedTier 3 — 15 questions

The final fifteen are the checkpoint before anyone can claim to truly know Tsukuba and the Kashima coast: the temple priest who funded a fireworks display from his own pocket, the role river ports played in carrying goods along the Tone toward Edo, the rocket program a space center first prepared for, and the reorganization behind a university's relocation. This is knowledge buried in the margins of the timeline, delivered with ordering and multiple-select formats that ask you to link scattered facts into a single thread. Clear this tier, and the top titles in the real quiz come within reach.

Q26.In which era did the Mt. Tsukuba Cable Car open?

  1. The Meiji era
  2. The Taisho era
  3. The early Showa (pre-war) era
  4. The late Showa (post-war) era
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Correct answerThe Taisho era

The Mt. Tsukuba Cable Car opened in Taisho 14 (1925). It is considered the second-oldest cable car in the Kanto region after the Hakone Tozan Cable Car, and the fifth-oldest in all of Japan; after a wartime suspension and postwar resumption of service, it still connects Miyawaki Station with Miyukigahara today.

Source:筑波山鋼索鉄道線 - Wikipedia (Japanese)Mt. Tsukuba Cable Car Guide | Ibaraki Travel Guide (mytabi.net)

Q27.When NASDA (National Space Development Agency of Japan), the predecessor of JAXA, began operations at the Tsukuba Space Center in 1972, what was the main preparatory work initially undertaken?

  1. Preparation for launching the N-I rocket
  2. Preparation for launching the H-II rocket
  3. Development of the Kibo experiment module
  4. Planning for the International Space Station
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Correct answerPreparation for launching the N-I rocket

The Tsukuba Space Center was established on June 1, 1972, when NASDA began preparatory work for launching the N-I rocket. Since then, the center has expanded into the core hub of Japan's space program, driving the development of the country's mainstay rockets and supporting operations of the Kibo module aboard the International Space Station.

Source:筑波宇宙センター - Wikipedia (Japanese)Tsukuba Space Center | JAXA

Q28.In what year was Tokyo University of Education, which formed the basis of the University of Tsukuba, formally dissolved?

  1. 1973
  2. 1976
  3. 1978
  4. 1980
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Correct answer1978

Tokyo University of Education continued to exist alongside the University of Tsukuba for several years after its founding, and was formally dissolved in 1978 once its remaining students had graduated. Behind the University of Tsukuba's adoption of the gakugun/gakurui system as a 'new-concept university' lay a goal of overcoming some of the drawbacks associated with the traditional faculty-autonomy structure.

Source:History - University of Tsukuba新構想大学 - Wikipedia (Japanese)

Q29.Approximately how many letters were sealed inside "Post Capsule 2001," a time capsule buried at Expo '85?

  1. About 360,000
  2. About 1.36 million
  3. About 2.36 million
  4. About 3.26 million
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Correct answerAbout 3.26 million

Post Capsule 2001 held approximately 3.26 million letters (3,260,636) submitted from around Japan, buried in hopes that they would be opened in a future year. The project drew considerable attention at the time as an attempt to carry the memory of Tsukuba Expo '85 forward to a future generation.

Source:国際科学技術博覧会 - Wikipedia (Japanese)

Q30.Roughly how large is Tsukuba City's population, as of 2025?

  1. About 100,000
  2. About 170,000
  3. About 260,000
  4. About 400,000
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Correct answerAbout 260,000

Tsukuba City's population is roughly 260,000 (as of 2025), making it one of the more populous cities in Ibaraki Prefecture. Its identity as a science city means it also has a large population of researchers, students, and international residents, a multinational character reflected in local events like Matsuri Tsukuba.

Source:Tsukuba, Ibaraki - Wikipedia (Japanese)

Q31.Approximately what is the surface area of Lake Kasumigaura?

  1. About 100 km²
  2. About 160 km²
  3. About 220 km²
  4. About 300 km²
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Correct answerAbout 220 km²

Lake Kasumigaura's surface area is approximately 220 km², making it Japan's second-largest lake after Lake Biwa. Numerous rivers of various sizes, including the Sakura and Koise, flow into it, making it one of the Kanto region's defining lakes.

Source:霞ヶ浦 - Wikipedia (Japanese)

Q32.Who was the head priest of Shinryuji Temple who funded, out of his own pocket, the fireworks display that became the origin of the Tsuchiura All Japan Fireworks Competition?

  1. Akimoto Baiho
  2. Kitajima Yoshikazu
  3. Kutsuki Taneteru
  4. Oda Ujiharu
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Correct answerAkimoto Baiho

Akimoto Baiho, the 24th head priest of Shinryuji Temple in the town of Tsuchiura (now Tsuchiura City), used his own funds to hold the fireworks event that started the tradition, owing to his close ties with the Kasumigaura Naval Air Group. Originally intended to console the souls of aviators killed in service, the event later grew into one of Japan's three great fireworks displays.

Source:土浦全国花火競技大会 - Wikipedia (Japanese)

Q33.Which structure, still standing at the entrance to the honmaru (main enclosure) of Tsuchiura Castle, is known as the only surviving yagura-mon (turret gate) in the Kanto region?

  1. Taiko-mon (Drum Gate)
  2. Ote-mon (Main Gate)
  3. Sakura-mon (Cherry Gate)
  4. Kabuki-mon (Wooden Bar Gate)
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Correct answerTaiko-mon (Drum Gate)

The Taiko-mon (drum turret gate) still stands at the entrance to Tsuchiura Castle's honmaru and is considered the only surviving castle yagura-mon in the Kanto region. Rebuilt into its current form in 1656, it survives today alongside the castle's multiple water moats as a reminder of a stronghold that, notably, never had a main keep.

Source:Tsuchiura Castle | Japan Castle Explorer (shirobito.jp)

Q34.Approximately how many rahotsu (hair curls) are on the Ushiku Daibutsu's head?

  1. About 120
  2. About 240
  3. About 480
  4. About 960
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Correct answerAbout 480

The Ushiku Daibutsu's head is said to have about 480 rahotsu curls, each crafted at a substantial size. It is one of many intricate details that make up the 120m-tall statue, alongside the more than 6,000 bronze plates covering its surface, together reflecting the precision behind its construction.

Source:牛久大仏 - Wikipedia (Japanese)

Q35.Where was Denbei Kamiya, founder of Ushiku Shuzo, originally from?

  1. Aichi Prefecture
  2. Ibaraki Prefecture
  3. Tokyo
  4. Osaka Prefecture
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Correct answerAichi Prefecture

Denbei Kamiya was born in Aichi Prefecture (the former Mikawa Province). After moving to Tokyo, he opened 'Kamiya Bar' in Asakusa and made his fortune with the 'Denki Bran' cocktail. He used that fortune to build Japan's first full-scale winery in Ushiku, introducing French grape varieties and Bordeaux-style winemaking methods.

Source:Denbei Kamiya - Wikipedia (Japanese)

Q36.Approximately how large is the precinct (including its sacred forest) of Kashima Jingu?

  1. About 20 hectares
  2. About 70 hectares
  3. About 120 hectares
  4. About 200 hectares
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Correct answerAbout 70 hectares

Kashima Jingu's precinct covers roughly 70 hectares, much of it covered by a rich sacred forest (chinju no mori). As the Ichinomiya of Hitachi Province and one of eastern Japan's most revered shrines, its approach to the main hall -- dedicated to Takemikazuchi-no-Kami, god of martial arts -- is lined with centuries-old trees.

Source:神宮 - Wikipedia (Japanese)

Q37.Kashima Antlers was one of the 'Original 10' clubs in the J.League when it launched in 1993. Which of the following was NOT among the conditions emphasized in selecting clubs at the time?

  1. Establishing a home town
  2. Meeting stadium standards
  3. Stable management foundations
  4. Winning the previous year's Japan Soccer League (JSL) championship
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Correct answerWinning the previous year's Japan Soccer League (JSL) championship

In launching the J.League, factors beyond mere strength in the JSL (Japan Soccer League) were emphasized, including regional ties (home town), stadium standards, and stable management foundations. Under this policy, the Sumitomo Metal Industries team -- competing at a second-tier level at the time -- still earned a place among the 'Original 10.'

Source:オリジナル10 - Wikipedia (Japanese)

Q38.In what Showa year did the Suigo Itako Iris Festival begin?

  1. Showa 22
  2. Showa 27
  3. Showa 32
  4. Showa 37
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Correct answerShowa 27

The Iris Festival began in Showa 27 (1952). What started as a small, informal gathering among local enthusiasts grew into a large-scale festival now showcasing about 500 varieties and roughly 1 million plants, drawing around 800,000 visitors annually.

Source:水郷潮来あやめまつり - Wikipedia (Japanese)

Q39.As of a mid-2020s report, for how many consecutive years has Ibaraki Prefecture ranked first nationally in melon production by prefecture?

  1. 17 consecutive years
  2. 22 consecutive years
  3. 27 consecutive years
  4. 32 consecutive years
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Correct answer27 consecutive years

Ibaraki Prefecture is said to have ranked first in melon production for 27 consecutive years, with Hokota City as its central production area. Starting from the introduction of Prince Melon cultivation in the early 1960s, the region later developed into a major producer of premium Earl's-type melons as well, including the brand 'Ibaraking.'

Source:Ibaraki Melons | Ibaraki Guide Official Website

Q40.What was the main role of the 'kashi' (river ports) established along the Tone River in the Edo period?

  1. Way stations for collecting goods such as tax rice and transporting them to Edo
  2. Checkpoints for controlling travelers
  3. Shelters during flooding
  4. Ports used exclusively for fishing
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Correct answerWay stations for collecting goods such as tax rice and transporting them to Edo

The kashi functioned as way stations that gathered goods, including tax rice, for transport to Edo by boat. The development of this river transport network was also driven by the Tone River Eastward Diversion Project, which rerouted the river's mouth from Tokyo Bay toward Choshi.

Source:Tone River Water Transport | Ibaraki Prefectural History Museum Digital Encyclopedia

Read more in the articles
The story of Kashima Shrine and the Kashima AntlersThe story of Lake KasumigauraThe story of Tsukuba Science CityThe story of Itako's waterways and Kashima Coast farmingThe story of Ushiku Daibutsu and Ushiku Chateau