Lake Okutama (奥多摩湖, Okutama-ko) is in Tokyo and Yamanashi Prefectures in Japan. Lying above the Ogōchi Dam, it is also known as the Ogōchi Reservoir. Lake Okutama is an important source of drinking water for Tokyo.

This article needs additional citations for verification. (December 2009)

Quick Facts Coordinates, Primary inflows ...

Lake Okutama
Lake Okutama
Coordinates	35°47′N 139°02′E
Lake type	reservoir
Primary inflows	Tama River, Kosuge River
Primary outflows	Tama River
Basin countries	Japan
Surface area	4.25 km2 (1.64 sq mi)
Max. depth	142 m (466 ft)
Surface elevation	526.5 m (1,727 ft)

Close

The lake occupies part of the town of Okutama in Nishitama District, Tokyo and the village of Tabayama in Kitatsuru District, Yamanashi.

The Taba (Tama) River feeds Lake Okutama at its western end. From the southwest, the Kosuge River also flows into the lake. The Tama River drains the lake at the eastern end. The surroundings are famous for cherry blossoms in the spring.^[1]