Wikipedia definition
1. Edo RiverThe Edo River is a river in the Kantō region of Japan. It splits from the Tone River at the northernmost tip of Narita City, crosses through Nagareyama and Matsudo, and empties into Tokyo Bay at Ichikawa. The Edo forms the borders between Tokyo, Chiba, and Saitama prefectures. Its length is 59.5 km. The course of the Edo River was previously the main course of the Tone River. It was diverted from the Tone in 1654 by the Tokugawa shogunate to protect the city of Edo from flooding.
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