Sumas River
| Sumas River | |
|---|---|
| Sumas River near the town of Nooksack, 2017 | |
| Location | |
| Country | Canada, United States | 
| Province | British Columbia | 
| State | Washington | 
| Physical characteristics | |
| Source | Sumas Mountain | 
| • coordinates | 48°52′40″N 122°18′32″W / 48.87778°N 122.30889°W | 
| Mouth | Fraser River | 
|  • coordinates | 49°9′N 122°7′W / 49.150°N 122.117°W | 
| Length | 58 km (36 mi) | 
The Sumas River is a river in the Fraser Lowland and a tributary of the Fraser River system, coursing across the international border between the Canadian province of British Columbia and the U.S. state of Washington.