Casummit Creek is a creek in Kenora District, Ontario, Canada. It flows from Casummit Lake at an elevation of to Birch Lake at an elevation of , whose waters flow via the Birch River, Cat River and Albany River into James Bay. There are three tributaries, all unnamed creeks, two from the left and one from the right. A portage leads from Birch Lake to just west of the Casummit Creek source point.
See also List of rivers of Ontario
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