The entire valley is about 12km long beautiful valley made by the lava flow. SP-X. Completed in 1988, the 13.1 kilometre long bridge is the world’s longest combined rail and road bridge. Japan’s Seikan Tunnel is the longest underwater tunnel in the world, and is located beneath the Tsugaru Strait. Admission for the Tunnel: 600 yen for Adult, 300 yen for under highschool. The Tokyo Bay Aqua-Line (東京湾 アクアライン, Tōkyō-wan Akua-rain), also known as the Trans-Tokyo Bay Expressway, is an expressway that is mainly made up of a bridge–tunnel combination across Tokyo Bay in Japan.It connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba Prefecture, and forms part of National Route 409. They are almost the longest and deepest Canal and Railway Tunnels in Britain. In this video we Urban explore Urbex the Standedge Canal and Railway tunnels. The tunnel is 54 kilometres long, and descends to a depth of 240 metres below the surface of the sea. It took 17 years and ¥538,000,000,000 to build, and opened in 1998. The longest Road tunnels in Japan, length and year of opening. The second place takes the 1988 opened Seikan tunnel in Japan, with just under 54 Kilometers in length. There is a group discount. Courtesy of christian111 via panoramio The world's longest tunnels are definitely not the place for a car to break down. There is a tunnel that has great observatories. The tunnel was constructed as the government’s response to the unfortunate sinking of five ferry ships due to a typhoon back in 1954, which resulted in public outrage. Tokyo (CNN)More than 1,000 people in Japan spent Thursday night stuck on a highway in their cars, waiting out a traffic jam with little food or water during a heavy snowstorm. It takes around 20 minutes to cross the bridge by car or train with the bridge offering spectacular views of the beautiful Seto Inland Sea between Okayama and Kagawa Prefectures. The tunnel connects Hokkaido Island with the Aomori Prefecture. Much of the system’s track runs through tunnels, including one under Shimonoseki Strait between Honshu and Kyushu, another on the Tokyo-Niigata line that is 14 miles (23 km) long, and another near Aomori with a record length (for a double-tracked inland tunnel) of 16.5 miles (26.5 km) when the bore was finished in 2005. There are parking and restroom. Road Tunnels in Japan (>3 000 m) Edited by: Gunnar Lotsberg and Eugenio A. Merzagora 6 th revision, March 2006: Tunnel: Length (m) Year of opening: Prefec. A Shinkansen bullet train passes through the Seikan Tunnel, the world's longest undersea tunnel that connects two of Japan's main islands by rail, in Hakodate, northern Japan on March 12, 2018. It is registered as the national scenic beauty and natural monument of Japan. 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