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The Seikan Tunnel (Japanese: 青函トンネル, Seikan Tonneru or 青函隧道, Seikan Zuidō) is a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.
The Shin-Kanmon Tunnel (新関門トンネル, shin-kanmon tonneru) is a 18.713-kilometre (11.628 mi) long undersea railway tunnel under the Kanmon Straits connecting Shin-Shimonoseki Station and Kokura Station
The Honshu-Shikoku Bridge Project (本州四国連絡橋, Honshū-Shikoku Renraku-kyō) is a system of bridges connecting the islands of Honshu and Shikoku across the Inland Sea of Japan, which were previously only connected by ferry. It consists of three major connections.
The term "Mainland Japan" is used to distinguish the large islands of the Japanese archipelago from the remote, smaller islands; it refers to the main islands of Hokkaido, Honshu, Kyushu, and Shikoku. [6] From 1943 until the end of the Pacific War, Karafuto Prefecture (south Sakhalin) was designated part of the mainland. Geographically speaking ...
Green: Great Seto Bridge Yellow: Kobe-Awaji-Naruto Expressway Red: Nishiseto Expressway When in 1889 the first railway in Shikoku was completed between Marugame and Kotohira, a member of the Prefectural Parliament, Jinnojo Ōkubo (大久保諶之丞, Ōkubo Jinnojo, 1849–1891), stated in his speech at the opening ceremony: "The four provinces of Shikoku are like so many remote islands.
Honshu – the largest and most populous island, with the capital Tokyo. Honshu is connected to the other three main islands by bridges and tunnels. Kyushu – the third largest main island, second most populous and the nearest to the Asian continent. Shikoku – the smallest and least populous main island, located between Honshu and Kyushu.
The Japanese archipelago consists of four major islands—Hokkaido, Honshu, Shikoku, and Kyushu—and thousands of smaller islands, covering 377,975 square kilometres (145,937 sq mi). Japan has a population of over 123 million as of 2025, making it the eleventh-most populous country.
Route sign Kanmon Bridge from the Moji side Bridge view View of main span. The Kanmon Bridge (関門橋, Kanmonkyō) (Asian Highway Network AH1) is a suspension bridge crossing the Kanmon Straits, a stretch of water separating two of Japan's four main islands.