The King Salmon River is a 35-mile (56 km) tributary of the Ugashik River in the U.S. state of Alaska. Beginning at Mother Goose Lake in the Aleutian Range, it flows northwest to meet the larger river near the upper reaches of Ugashik Bay. The lake and the upper course of the King Salmon lie within the Alaska Peninsula National Wildlife Refuge. The river's gravel bottom and braided channels are ideal for the many king salmon that spawn in its waters, but they limit navigation to small skiff.