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The Tenryū River (天竜川, Tenryū-gawa?) drains the eastern portion of central Honshū, Japan. From its source at Lake Suwa in Okaya, Nagano Prefecture, it extends 213 km, grazing Aichi Prefecture en route to its mouth at the boundary between the cities of Hamamatsu and Iwata in Shizuoka Prefecture. It drains 5,050 km² into the Enshū Sea. In length, it is Japan's 9th longest river.
With a descent of more than 750 m, it is well suited to generation of hydroelectric power. The Sakuma Dam is rated at 350,000 kW; the Akiba Dam adds another 127,000 kW. Dams are also used for controlling flooding.
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