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Tonsa from Lower Minnestimma Lake.jpg
Tonsa (center) seen from Larch Valley flanked by Mount Bowlen on left and Mount Perren on right
Highest point
Elevation 3,053 m (10,016 ft)
Prominence 173 m (568 ft)
Parent peak Mount Bowlen (3072 m)
Listing Mountains of Alberta
Mountains of British Columbia
Tonsa is located in Alberta
Location in Alberta
Tonsa is located in British Columbia
Location in British Columbia
Location Alberta / British Columbia
Parent range Bow Range
Canadian Rockies
Topo map NTS 82N/08

Tonsa, or Tonsa Peak, is a 3,053-meter-elevation (10,016-foot) mountain summit located on the border of Alberta and British Columbia on the Continental Divide in the Canadian Rockies. The mountain forms part of the backdrop to Moraine Lake in the Valley of the Ten Peaks of Banff National Park. It was named in 1894 by Samuel E.S. Allen for the Stoney Indian word for the number four.


Like other mountains in Banff Park, Tonsa is composed of sedimentary rock laid down during the Precambrian to Jurassic periods. Formed in shallow seas, this sedimentary rock was pushed east and over the top of younger rock during the Laramide orogeny.


Based on the Köppen climate classification, Tonsa is located in a subarctic climate zone with cold, snowy winters, and mild summers. Temperatures can drop below −20 °C with wind chill factors below −30 °C. Precipitation runoff from Tonsa drains east into tributaries of the Bow River, or west into tributaries of the Vermilion River.

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