The Metropolitan Area Outer Underground Discharge Channel is located in Kasukabe city, Saitama prefecture. They are currently offering tour visits, in which visitors can learn the cutting-edge technology that protects people from flood damage while enjoying its interior structure that resembles a huge temple. This site, popular for its mysterious atmosphere, is also known as a filming and shooting location. You can apply for a tour visit at their official website.
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• https://gaikaku.jp/