Tama River

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The Tama River (多摩川, Tama-gawa) is a major river in Yamanashi, Kanagawa and Tokyo Prefectures on Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government. It is 138 kilometres (86 mi) long, and has a 1,240 square kilometres (480 sq mi) basin.

The river flows through the Greater Tokyo Area, on the dividing line between Tokyo and Kanagawa Prefectures. In Tokyo, its banks are lined with parks and sports fields, making the river a popular picnic spot.