Sumallo River
General data
- Name: Sumallo River
- Water system: Skagit River
- Water type: River
- Progression: Skagit River -> Skagit Bay -> Puget Sound -> Salish Sea -> Pacific Ocean -> Planet Earth
- Climates: Continental
- Continents: North America
- Countries: Canada
The Sumallo River is located in southern British Columbia, in the Cascade Mountains to the east of Hope. It begins on the east slopes of Mount Payne, south of the village of Sunshine Valley. It flows north until it reaches Sunshine Valley where it turns southeast and proceeds into Manning Park. It continues southeast within the park, running alongside Highway 3 before eventually meeting the Skagit River at the northern boundary of Skagit Valley Provincial Park, to the northeast of Marmot Mountain.