Metropolitan Area Outer Underground Discharge Channel
In Japanese: 首都圏外郭放水路
A giant flood-control facility whose pillared surge tank, nicknamed the 'underground temple', can be toured on booked visits.
Nearby
- Ushijima Wisteria (Tokaen) ≈ 25 min by car
- Hondoji Temple ≈ 50 min by car
- Koga Kubo Park (Koga Sogo Park) ≈ 55 min by car
- Tojo-tei (Tojogaoka Historical Park) ≈ 1 h by car
- Gongendo Park (Gongendo Cherry Embankment) ≈ 1 h 5 min by car
Travel times are rough estimates by car.
- Getting there
- Kasukabe community bus (Haru Bus) from Tobu Minami-Sakurai Station; or 25-30 min walk
- Fee
- Tours from ¥1,200 (Underground Temple course, about 55 min)
- Booking
- Tours are by advance reservation only; no same-day booking or waitlist. Booking opens 0:00 one month before and closes 23:59 the day before (official). official ↗
- Good to know
- Advance booking required; tours 10:00-16:00 daily except inspection days; no children below school age
- Time needed
- 1 h 30 min
Checked against the official Japanese website on 2026-10-12. Report outdated info