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Kasukabe, Japan

G-Cans: the World's Largest Drain

The world's largest drain sits below the city of Saitama, Japan 

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The G-Cans project (Shutoken Gaikaku Housui Ro, or the Metropolitan Area Outer Underground Discharge Channel) is a massive underground waterway and water storage area built by the Japanese government to protect Tokyo from flooding during the monsoon seasons.

Begun in 1992, the two-billion-dollar project was completed in 2009. The tunnels run over 100 km, but perhaps the most impressive features of the drainage system are the 213-foot-tall silos and the 83-foot-tall, 580-foot-long pillared main tank known as the “Underground Temple,” which was built to collect run-off from the city’s waterways. The humongous drainage system can pump over 200 tons of water a second.

A free tour is offered in Japanese only. It is requested that you bring along a translator for “safety reasons.”

Explorer of Japanese ruins Michael John Grist will be leading an Obscura Day expedition to the G-Cans project, a massive underground waterway and water storage area built by the Japanese government to protect Tokyo from flooding during the monsoon seasons.

Know Before You Go

By train '40 minutes' walk from Mimami-Sakurai Station, Tobu Noda Line. (Approx. 3km)
By car '30 minutes' drive on Route 16 toward Noda, from Iwatsuki IC of Tohoku Expressway. (Approx.17km)
'40 minutes' drive on Route 16 toward Noda, from Kashiwa IC of Joban Expressway. (Approx.20km)

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