Somass River is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 on Vancouver Island

Vancouver Island

Vancouver Island is a large island in British Columbia, Canada. It is one of several North American locations named after George Vancouver, the British Royal Navy officer who explored the Pacific Northwest coast of North America between 1791 and 1794...

, in the Canadian province

Provinces and territories of Canada

The provinces and territories of Canada combine to make up the world's second-largest country by area. There are ten provinces and three territories...

 of British Columbia

British Columbia

British Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...

. Its drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 is 1412 square kilometres (545.2 sq mi) in size.

The river's name comes from a Nuu-chah-nulth

Nuu-chah-nulth language

Nuu-chah-nulth is a Wakashan language spoken in the Pacific Northwest of North America, on the west coast of Vancouver Island from Barkley Sound to Quatsino Sound in British Columbia, by the Nuu-chah-nulth people...

 word meaning "washing".

Course

The Stamp River and Sproat River join to form the Somass River, which flows generally southeast and south into Alberni Inlet. The river crosses Highway 4 outside of Port Alberni.