Revisit this archived Japanese Islands challenge and explore Japan’s remarkable archipelago—from the four main islands to subtropical Okinawa, ancient cedar forests, remote World Heritage islands and a major rocket-launch center.
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Four Main IslandsChallenge level: ★☆☆
1
Which is the largest of Japan’s four main islands?
Correct answer: Honshu. Honshu is Japan’s largest main island and contains many of the country’s best-known cities, including Tokyo, Yokohama, Kyoto, Osaka and Hiroshima.Geography note: Honshu accounts for roughly three-fifths of Japan’s land area, making it the physical and population center of the country.
HokkaidoChallenge level: ★☆☆
2
Which of Japan’s four main islands is the northernmost?
Correct answer: Hokkaido. Hokkaido is the northernmost of Japan’s four main islands and is known for colder winters, extensive national parks, volcanic landscapes and large agricultural areas.City connection: Sapporo, Hokkaido’s prefectural capital, is famous for its annual snow festival and hosted events during the 1972 Winter Olympics.
ShikokuChallenge level: ★☆☆
3
Which is the smallest of Japan’s four main islands?
Correct answer: Shikoku. Shikoku is the smallest of the four main islands. It is divided into the prefectures of Tokushima, Kagawa, Ehime and Kochi.Cultural connection: The island is renowned for the Shikoku Pilgrimage, a route linking 88 Buddhist temples associated with the monk Kūkai, also known as Kōbō Daishi.
KyushuChallenge level: ★★☆
4
Which main island is Japan’s third largest and is especially noted for volcanoes and hot springs?
Correct answer: Kyushu. Kyushu is the third-largest of Japan’s four main islands. Its active geology supports dramatic volcanic scenery and famous hot-spring areas such as Beppu and the regions around Mount Aso.Regional role: Kyushu lies in southwestern Japan and has long served as an important gateway for cultural and commercial exchange with continental Asia.
Seto Inland SeaChallenge level: ★★☆
5
The Seto Inland Sea lies between which three Japanese main islands?
Correct answer: Honshu, Shikoku and Kyushu. The Seto Inland Sea is the sheltered body of water separating parts of western Honshu from Shikoku and eastern Kyushu. It contains numerous smaller islands.Human geography: Bridges, ferries and shipping routes connect communities across this historically important inland sea.
Okinawa IslandsChallenge level: ★★☆
6
Which kingdom historically ruled many of the islands now forming Okinawa Prefecture?
Correct answer: Ryukyu Kingdom. Okinawa’s islands developed a distinctive culture through the Ryukyu Kingdom, which maintained maritime trade and diplomatic ties across East and Southeast Asia.Living heritage: Ryukyuan history remains visible in castle sites, music, dance, cuisine and local languages, while Okinawa is also recognized as the birthplace of karate.
YakushimaChallenge level: ★★☆
7
Which Japanese island is a UNESCO World Heritage site celebrated for ancient sugi cedar forests and exceptional biodiversity?
Correct answer: Yakushima. Yakushima, south of Kyushu in Kagoshima Prefecture, protects ecosystems ranging from subtropical coastal vegetation to cool mountain forests. UNESCO highlights its rich flora and ancient sugi, or Japanese cedar, specimens.Ecology note: The island’s steep elevation changes and heavy rainfall create many habitats within a relatively compact area.
Ogasawara IslandsChallenge level: ★★★
8
Which remote Japanese island group, also called the Bonin Islands, is recognized by UNESCO for its distinctive evolutionary processes?
Correct answer: Ogasawara Islands. The Ogasawara Islands lie roughly 1,000 kilometers south of Japan’s main archipelago. Their long isolation encouraged the development of endemic plants and animals, making them important for studying evolution.Conservation challenge: Protecting native ecosystems requires careful control of invasive species introduced by human activity.
Sado IslandChallenge level: ★★★
9
Sado Island, known for historic gold and silver mining and traditional taiko culture, belongs to which prefecture?
Correct answer: Niigata. Sado Island lies off the coast of Niigata Prefecture in the Sea of Japan. Its mines once produced valuable gold and silver, and the island is now strongly associated with the internationally known Kodo taiko ensemble.Nature note: Sado also supports conservation efforts for the Japanese crested ibis, known in Japan as the toki.
TanegashimaChallenge level: ★★★
10
Which major Japanese aerospace facility is located on Tanegashima Island?
Correct answer: Tanegashima Space Center. JAXA operates the Tanegashima Space Center along the island’s southeastern coast in Kagoshima Prefecture. It is Japan’s largest rocket-launch complex and supports the assembly, testing and launch of major vehicles and spacecraft.Island innovation: Tanegashima combines coastal landscapes and local history with a central role in Japan’s modern space program.