Lake Yamanaka (山中湖 Yamanaka-ko) is located in the village of Yamanakako in Yamanashi Prefecture near Mount Fuji, Japan. It is the largest of the Fuji Five Lakes in terms of surface area, and is the highest of the Fuji Five Lakes in terms of elevation. It is also the third highest lake in Japan, with a mean surface altitude of 980.5 metres (3,217 ft). Conversely, the lake is also the shallowest of the Fuji Five Lakes, with a maximum water depth of only 13.5 metres (44 ft). The lake, which was formed by lava flows from an ancient eruption of Mount Fuji, is drained by the Sagami River, and it is the only of the Fuji Five Lakes to have a natural outflow. Carp, dace and smelt were introduced to the lake in the Meiji period, although early efforts to introduce sockeye salmon were not successful. In more recent years, introduced exotics such as black bass and bluegill have increasingly displaced native species. In terms of plant life, a variety of marimo was discovered in the lake in 1956. The lake is a popular recreational site for boating, fishing, water-skiing, windsurfing, sightseeing and swimming. If the wind comes from the west, the lake provides a smooth lift for paragliding at Mount Myōjinyama. There are also small cabins and sites available for camping. The lake is within the borders of the National park (Fuji-Hakone-Izu National Park). In 2013 the lake was added to the World Heritage List as part of the Fujisan Cultural Site.

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