Guide
The Metropolitan Area Outer Underground Discharge Channel is a massive flood-control system designed to mitigate water damage in the Tokyo metropolitan area. Located at a depth of approximately 50m beneath Kasukabe City, Saitama, it is one of the largest underground discharge channels in the world. The sight of the pressure-regulating tank, lined with colossal pillars, is often referred to as the 'Underground Temple' due to its divine and overwhelming scale.
Attached to the facility is the 'Ryukyu-kan' museum, which serves to exhibit and introduce this advanced infrastructure technology. The name 'Ryu' (Dragon) is derived from the local legend of the 'Fire-preventing Dragon' of the Showa district, while 'Q' stands for 'aqua' (water).
This project was initiated to reduce flooding damage in the Nakagawa and Ayase River basins. Construction by the Ministry of Land, Infrastructure, Transport and Tourism began in 1993. The first section began operation in June 2002, and the entire system was completed and fully operational by June 2006.
Local culture is also reflected in the facility's name and exhibits. For example, a massive dragon painting created during an event held within the pressure-regulating tank is still preserved and displayed above the Ryukyu-kan citizen gallery, serving as a symbol of the facility.
The greatest attraction is undoubtedly the view of the pressure-regulating tank, known as the 'Underground Temple.' The sight of 59 massive pillars, each 18m high and weighing 500 tons, offers a sense of scale that is hard to believe exists underground. Additionally, the Ryukyu-kan exhibition area features various documents and models that allow you to visually understand the mechanisms used to prevent urban flooding.
As this is an underground infrastructure facility, the environment differs from the surface. Details regarding exhibitions and tours may vary depending on the season or operational status. It is highly recommended to check the official website for the latest information before visiting.
At Ryukyu-kan, you can engage in educational experiences regarding the flood control technology that protects cities. Through various exhibits, you can learn about the mechanisms of the massive underground discharge channels and the pump systems used for drainage. The facility also serves as a meeting point for guided tours, offering a chance to experience the sheer power of the underground structure with professional explanations.
Ryukyu-kan is located within the Showa Drainage Pump Station. The surrounding area consists of residential neighborhoods in Kasukabe City, Saitama, and is near major roads such as National Route 16. There are various spots nearby where you can feel the local history and culture.
Please check the official website in advance regarding any fees for facility tours or related costs. Information regarding whether cash or credit cards are accepted should be confirmed prior to your visit.
While some English signage may be available within the facility, detailed explanations are primarily provided in Japanese.
Guided tours may require advanced reservations or may involve an admission fee. Please be sure to check the official website in advance to confirm if a reservation is necessary.
As you will be visiting an underground facility, we highly recommend wearing comfortable walking shoes. Please dress appropriately for an underground environment.
Photography restrictions may apply to certain areas within the facility. Please follow the instructions of the staff when handling exhibits or moving through the facility.