Bow (bō) [key], river, 315 mi (507 km) long, rising in the Rocky Mts., S Alta., Canada, and flowing SE through Banff National Park. It emerges from the mountains in the Bow River Pass and continues past Calgary southeastward across the plains to its junction with the Belly River to form the South Saskatchewan River. Several dams have been built along the Bow, most notably the Bassano or Horseshoe Bend Dam (built 1912).
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