The Kaministiquia River is a river which flows into western Lake Superior at the city of Thunder Bay, Ontario. Kaministiquia is an Ojibwe word meaning "where a stream flows in island" due to two large islands at the mouth of the river. The delta has three branches or outlets, reflected on early North American maps in French as "les trois rivières" : the southernmost is known as the Mission River, the central branch as the McKellar River, and the northernmost branch as the Kaministiquia. Residents of the region commonly refer to the river as the Kam River.

Lake Superior is the largest freshwater lake in the world by surface area and the third-largest freshwater lake by volume, holding 10% of the world's surface fresh water. Located in central North America, it is the northernmost and westernmost of the Great Lakes of North America, straddling the Canada–United States border with the Canadian province of Ontario to the north and east and the U.S. states of Minnesota to the west and Michigan and Wisconsin to the south. It drains into Lake Huron via St. Marys River, then through the lower Great Lakes to the St. Lawrence River and ultimately the Atlantic Ocean.