Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!!

by Nobu - Japan Licensed Guide
(61) Reviews

It is located in Kasukabe, a satellite city of Tokyo. This facility is the "Metropolitan Area Outer Underground Discharge Channel"  managed by the Ministry of Land, Infrastructure, Transport and Tourism, but well known as the "Underground Temple" due to its unique structure.

The function of this facility is to transport the flood water from the rivers to the underground tunnel so that it can be diverted and drained out to the safer large river.  It means the facility for preventing Tokyo Metropolitan Area from floods. 

If you have a free day during your stay in Tokyo, why don't you visit the amazing facility? 


 Outline of the facility tour is as follows:

Maximum number of participants: 50 people / tour

Duration: approximately 60 minutes (including ① Explanation of the facility, ② visit to the water pressure regulation chamber and ③ visit to the vertical well)

Participation fee: 1,000JPY / person


1) You need to make a reservation in advance either by phone or online.

2) Since all the instructions and explanations are given by Japanese only, you need to include at least one person who can understand Japanese.

3) Wearing comfortable shoes is recommendable because you need to go down and up nearly 100 steps when you visit the water pressure regulation chamber. (You may not be able to participate in the tour if you wear high heels or sandals.)


The is tour is available only on weekdays. I can arrange a half day tour or a full day tour convined with some excursion from Tokyo. If you are interested in this facility, please feel free to contact me. It will be a special experience for you in Japan.


By Nobu

Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!! The water pressure regulation chamber known as "Underground Temple".

Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!! The vertical well viewed from the  water pressure regulation chamber.

Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!!

The vertical well viewed from the ground level.

Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!! Unterground Temple is located under the football ground. 

Underground Temple?! No, the Largest Underground Water Diversion Facility in the World!!

 We can go to the facility from the nearest train station either by this lovely local bus or a taxi.

Did you like my article?

You can send me a message to get a customized itinerary and quotation for an unforgettable experience. Let's explore Japan Together.

I'll be waiting for you, so please check my profile and get your trip plan now


Licensed Guide
(61) Reviews

Related Blogs

Bamboo Garden in Hokokuji Temple, Kamakura

by Nobu
If you are planning to visit Kyoto, you may include Bamboo Grove in Arashiyama. I know it is one of  must visit spots in Kyoto and recomm...

Winter - The Best Season to See Mt. Fuji

by Nobu
Do you know which is the best season to see Mt. Fuji? The answer is Winter without any possibility of doubt! The main reasons are: 1) T...

Hiraizumi - The Legend of Zipangu, the Land of Gold

by Nobu
Have you ever heard about Zipangu, the Land of Gold? The Venetian merchant, Marco Polo (1254-1324) wrote about Zipangu in his book The Tra...

Sawara, the nearest “Koedo” from Narita Airport

by Nobu
There are several cities called “Koedo” in Japan. “Ko” means small and “Edo” is the old name of Tokyo. Therefore Koedo means a “small old To...

Sake Brewing Season - Winter

by Nobu
Do you like sake? If yes, do you know when the sake brewing season is? It is brewed in in winter! It is because sake needs cold temperature....

Another Naritasan, Naritasan Park

by Nobu
You may have visited Naritasan Shinshoji Temple which is one of the most popular temples in Japan. Since it is in 30 minute distance from Na...

Tours by Guide

Plan your trip to Saitama with Nobu

Chat with a local tour guide who can help organize your trip.
Send a message

Recent Tour Reviews in Saitama

“ Very professional and patient ”

1 week ago Traveler: Rini -   Tour Guide: Nobu

Nobu is an amazing guide who knows how to navigate the ways. We went around Tokyo City for a day and another one was spent at Sendai. He knew of the places and history, so we were made aware of the stories behind a particular building/area etc. We had a 4 year old active child and must compliment that Nobu was very patient with her. Thank you for all your help, Nobu!
read more

“ Half day whistle stop tour of tokyo ”

2 weeks ago Traveler: Mark -   Tour Guide: Nobu

Nobu was a very knowledgeable guide, he drew up the itinerary and we visited a number of sites of historic, cultural interest both by foot ant train. He went at a good pace and always explained the significance of what we were seeing and also put things into todays context. Overall an excellent tour.
read more

“ Chiba Tour ”

1 month ago Traveler: Daniel -   Tour Guide: Nobu

The family thanks Nobu for a memorable experience through the Chiba Prefecture. To witness the Prefecture's resiliency after Typhoon Faxai was encouraging. Nobu made adjustments due to some establishments were still closed due to the typhoon, but was able to provide the family with the key points that we had discussed, and verified in advance that those sites were still accessible. He also s...
read more

“ Wonderful fun day,, ”

2 months ago Traveler: Col -   Tour Guide: Nobu

Great day with Nobu... we had a larger group that always presents challenges with interests in the tour as well as problems with ticket purchases etc... none of these was an issue for Nobu and we had a great day... even when we decided at short notice to change the tour he handled these easily...Highly Recommended tour guide !
read more

“ Underground Adventures: Kasukabe/Tokyo Flood Prevention Complex ”

4 months ago Traveler: Jeff -   Tour Guide: Nobu

My partner and I spent the morning/early afternoon exploring the Metropolitan Area Outer Underground Discharge Channel, aka Kasukabe Underground Flood Protection Tank, aka G-Cans. As foreign visitors who don't speak Japanese fluently, we needed a Japanese speaking guide who could interpret for us (presumably for safety reasons). We found Nobu via the TripleLights website and he was excellent. N...
read more

“ Tokyo with a pre-schooler in one day! Yes, it is possible, if you have a guide like Nobu! ”

4 months ago Traveler: Svetlana -   Tour Guide: Nobu

Nobu was really fantastic! I cannot recommend him enough. I was travelling with my 5 yo son and needed an experienced guide who could recommend places to visit and guide us through amazing Tokyo. He was just that and more. Nobu’s English is excellent, he is a very polite, possess wealth of knowledge about Tokyo and culture which he shares with you along the way and he was 100% in tune with what we...
read more

“ Visit the ricoh factory ”

4 months ago Traveler: Suzanne -   Tour Guide: Nobu

Really nice and happy translator which helped us really good!
read more

“ Very friendly ”

5 months ago Traveler: Woong -   Tour Guide: Nobu

Nobu was patient and kind. He was very knowlegeable about Hakone park and showed us all of the beautiful locations.
read more

“ 1/2 Tokyo highlights tour ”

5 months ago Traveler: Cindy -   Tour Guide: Nobu

Had a great afternoon with Nobu at a very last minute booking. He took us to the most popular Tokyo attractions and was very helpful showing us how the trains worked and with our Shinkansen bookings. Very informative about the city and easy to get on with.
read more

“ Last minute amazing trip! ”

5 months ago Traveler: Elena -   Tour Guide: Nobu

I booked my trip with less than a day notice and I had about a nine hour layover in Narita. Nobu was so unbelievably helpful and knowledgeable and it was great to see so many places in such a short time! I definitely can not wait to go back to Japan! Nobu was so nice and I definitely would recommend for anyone who would like a fun and educational time!!! Thanks Nobu!!!
read more

Related cities