|Countries||Canada, United States|
|Length||58 km (36 mi) |
The Sumas River originates in Whatcom County, Washington just north of the Nooksack River and west of Sumas Mountain. It flows generally northeast, crossing the Canada–United States border and emptying into the Fraser River.
The Sumas River used to flow into Sumas Lake, a large lake on the Fraser River's floodplain. In the 1920s the lake was drained.
- List of tributaries of the Fraser River
- List of British Columbia rivers
- List of rivers of Washington