The Metropolitan Area Outer Underground Discharge Channel is one of the world’s largest underground discharge channels that has been built to mitigate flood damage in the metropolitan area. It is about 50m underground and about 6.3km long from Kamikanezaki in Kasukabe City to Obuchi.

In addition to this “Pressurization Water Tank”, there is also a tour (fee required) that shows newly opened the pump room, and gas turbine section, which was not open to the public. The huge space like a secret base spreading underground is a masterpiece!

A solemn atmosphere is like a temple. You will be surely overwhelmed by the huge underground space!

Business Hours
10:00-16:00 (last tour ends at 17:00), closed on facility inspection days

Fee
From 1,000 yen (depending on the course)

Access
[Car] About 30 minutes from Ken-O Expressway “Satte” IC / “Goka” IC
About 30 minutes from Tohoku Expressway “Iwatsuki” IC
About 40 minutes from Joban Expressway “Kashiwa” IC

Address
720 Kamikanezaki, Kasukabe City, Saitama Prefecture