Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Sagami River is a river in Kanagawa and Yamanashi Prefectures on the island of Honsh , Japan. The upper reaches of the river in Yamanashi prefecture are also sometimes known as the Katsura River , and the portion near the river mouth as the Banyu Rive. The river overall was sometimes referred to as the Ayu River from the sweetfish (ayu) which were once abundant in its waters. The Sagami River drains Lake Yamanaka, the largest and easternmost of the Fuji Five Lakes in Yamanashi Prefecture. It loops northwest, then northeast through Yamanashi, before following a generally southerly course to exit into Sagami Bay of the Pacific Ocean between the cities of Hiratsuka and Chigasaki. It is dammed at several locations along the way, forming a number of reservoir lakes, the largest of which are Lake Sagami and Lake Tsukui.