Lake Yamanaka (山中湖, Yamanaka-ko, 'Lake in the Mountains') is located in the village of Yamanakako in Yamanashi Prefecture near Mount Fuji, Japan.

In more recent years, introduced exotics such as black bass and bluegill have increasingly displaced native species.

The lake is a popular recreational site for boating, fishing, water-skiing, windsurfing, sightseeing and swimming.

[2] In 2013 the lake was added to the World Heritage List as part of the Fujisan Cultural Site.

[3] Early in the morning, when traffic is light on the Tōmei and Chūō Expressways, traveling between Tokyo and Lake Yamanaka takes an hour.