Tama River, River system in Greater Tokyo Area, Japan
The Tama is a 138 kilometer river flowing from Mount Kasatori through three prefectures, forming the natural boundary between Tokyo and Kanagawa Prefecture. The riverbed varies from rocky mountain sections to wide plains near Tokyo Bay.
In the 17th century an aqueduct was built from the river to Edo to supply fresh water to the growing city. Later, the Ogochi Dam was built in the upper course, creating a large reservoir to supply the metropolitan area.
Locals use the riverbanks for different leisure activities, from morning jogging to weekend barbecues. The river name combines characters meaning jewel water, reflecting its traditional role as a resource for the city.
Several bridges connect both banks of the river, allowing visitors to move between the different parks and walking trails. Bicycle paths extend along large portions of the riverbank and provide access to less populated sections of the watercourse.
Lake Okutama formed through the damming of the river and now serves as a main water source for several million residents of the capital region. The lake sits in a forested mountain area and can be explored by visitors through boat tours.
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