G-Cans 首都圏外郭放水路

The underground canal system

Tokyo is equipped on its outskirts with an immense water drainage system for the various rivers that cross the territory of the metropolis. The reserves and the canals that support this underground system are impressive in their size and are open to the public for tours!

Protection against the fury of the waters


The work of the G-Cans, or "shutoken gaikaku hosuiro" in Japanese meaning "anti-flood tunnel of the outer metropolitan area" began in 1993, to be put into service 13 years later, in 2006.

Built between Showa in Tokyo and Kasukabe in Saitama prefecture, north of the capital, the complex extends over 6.4 kilometers, 50 meters below the surface of the earth.


G-Cans tank


A place of tourist passage


This system works during heavy rains. During the dry period, unused, it can be visited. However, certain constraints are imposed.

It is indeed necessary to reserve your place in advance, a visiting group cannot number more than 50 people, and it is necessary to speak Japanese or to be accompanied by an interpreter who can translate the explanations and inform the visitors in case of need for evacuation.

Tourists in the G-Cans

Wiki commons

Address, timetable & access

  • Address

  • Phone

  • Timetable

    From Shibuya station, take the Hanzomon line to Kasukabe station (about 1h10). Take the Noda line and stop at Minami-Sakurai station (7 min) from where a bus line leads to G-Cans.
  • Price

    1,000 yen (about $8.50/8€)
  • Access

    Monday to Sunday: 10 am to 4 pm.

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