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Shakujii River

The Shakujii River (石神井川, Shakujii-gawa) is a river which flows through the northwest quadrant of central Tokyo, Japan. It is one of the tributaries of the Arakawa River. With a total length of 25.2 kilometres (15.7 mi) and a drainage basin of 61.6 square kilometres (23.8 sq mi), it is categorized as a Class A river by the Japanese government.
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Length:  25.2 km (15.7 mi)  

Shakujii River  Click to go to Wikipedia