Lake Iruka is a reservoir located near the Meiji Mura theme park in Inuyama, Aichi, Japan. In 1868 the dam holding the reservoir collapsed after heavy rain. In the resulting flood, 941 people lost their lives.
Wikipedia https://en.wikipedia.org/wiki/Lake_Iruka
Address Japan
Coordinates 35°20'33.198" N 136°59'53.65" E
