The Government of Alberta defines the larger basin formed by the Bow, Oldman, Red Deer and the Alberta portion of the South Saskatchewan Rivers as the South Saskatchewan River Basin (SSRB).
In general, begin in the Rocky Mountains, generally flowing eastward through foothills and prairie. The combined watershed of the basins is 121,095 km2, of which 41% is from the Red Deer sub-basin. The mean annual discharge from the combined basin into Saskatchewan is 9,280 million m3.
The Red Deer River, Oldman River, Bow River, and South Saskatchewan River (left to right)
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