The English River is a river in Kenora District and Thunder Bay District in Northwestern Ontario, Canada.[3] It flows through Lac Seul to join the Winnipeg River at Tetu Lake as a right tributary.[4] The river is in the Hudson Baydrainage basin, is 615 kilometres (382 mi) long and has a drainage basin of 52,300 square kilometres (20,200 sq mi).[2] Although there are several hydroelectric plants on this river, the English River upstream of Minnitaki Lake is notable as one of the few large river systems in northwestern Ontario with a natural flow and without any upstream source of pollution.[5] It is the fourth longest river entirely in Ontario.[citation needed]
The English River forms in Thunder Bay District, just east of English River settlement on the boundary with Kenora District. Flowing north straddling the district boundary until Mattawa Lake, it continues northwest through Minnitaki Lake and passes Sioux Lookout, the largest town along its course. Through Lac Seul, it flows to its mouth at Tetu Lake on the Winnipeg River, which flows via the Nelson River to Hudson Bay.[4] It flows through numerous lakes during its course.