The Rainy-Lake of the Woods Watershed is 27,000 square miles or 70,000 square kilometers and stretches from just west of Lake Superior to its outflow into the Winnipeg River at Kenora, Ontario, Canada. It is made up of ten sub-basins, each with its own unique characteristics.

Shoal Lake Lake of the Woods Lower Rainy Rapid River Big Turtle River Rainy Lake Big Fork River Little Fork River Vermilion Rainy Headwaters