Shiromaru Dam (yes, there is a dam in Tokyo!), is located in the Okutama area in western Tokyo. On top of being in the beautiful mountainous area of Okutama in west Tokyo, Shiromaru Dam has a very unique feature: a fish ladder! This 1082.6ft (330m) fish ladder helps to migrate trout to get upstream in spectacular fashion! This fish ladder is also the longest of any fish ladders found in Japan!