Local Secret · Kasukabe
Metropolitan Area Outer Underground Discharge Channel (G-Cans) 首都圏外郭放水路
Giant underground flood-control tank with 59 massive pillars, nicknamed the 'underground temple', visited on guided tours.
Getting thereMinami-Sakurai Station (Tobu Urban Park Line), about 35 min walk or taxi
Time needed1-2 hours
Address720 Kamikanasaki, Kasukabe, Saitama 344-0111
About
This flood-control system runs 6.3 km under Route 16 to protect the Tokyo area from flooding. Its surge tank, 177 m long and 18 m high with 59 huge concrete pillars, is open on guided tours that start at the Ryu-Q-Kan visitor center; tours sell out quickly.
Highlights
- Pressure-adjusting tank with 59 pillars
- Guided tours from Ryu-Q-Kan
- World-class flood infrastructure
- Dramatic photo setting
Tips
- Book tours online in advance; tours cancel if flooding is expected
- Tours are in Japanese; some English options are offered
Open in Google Maps · Info checked 2026-10-11
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