Planning to visit beautiful lakes while you are in Japan? Lakes in touristy areas in Japan have boats to show you around. There are popular lakes to tourists such as Biwa-ko which is in Shiga Prefecture and is the largest lake in Japan, Kawaguchi-ko which is located bottom of Mt. Fuji in Yamanashi Prefecture, and Akan-ko which has Marimo (moss balls-national treasure) in Hokkaido. You can take a tour on the boat or rent a small boat for fishing in these areas.