The Bow River originates in the Canadian Rockies with its headwaters at Bow Lake in Banff National Park. It flows 587 km (365 mi) south through the town of Banff and east through Canmore and the foothills, through the city of Calgary and on through the prairies to join the Oldman River. Together they form the South Saskatchewan River, which eventually empties into Hudson Bay. Some say the river got its name from the indigenous Cree, referring to the excellent bow-making wood along its banks. The river is famous for its trout fishing.