St. Mary River

The St. Mary River (sometimes represented as the St. Mary's River) is a river in the East Kootenay region of British Columbia. It rises in the Purcell Mountains and flows in a generally southeasterly direction to its confluence with the Kootenay River at Fort Steele, British Columbia.

Source: Wikipedia https://en.wikipedia.org/wiki/St._Mary_River_(British_Columbia)