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Waterton River

Waterton Lake
Goat Haunt Overlook.jpg
Seen from Goat Haunt
Location Waterton Lakes National Park, Alberta, Canada / Glacier National Park, Glacier County, Montana, United States
Coordinates 49°03′01″N 113°52′53″W / 49.05028°N 113.88139°W / 49.05028; -113.88139Coordinates: 49°03′01″N 113°52′53″W / 49.05028°N 113.88139°W / 49.05028; -113.88139
Primary outflows Waterton River
Basin countries United States, Canada
Surface area 10.1 km2 (3.9 sq mi) +1.5 km2 (0.58 sq mi)
Average depth 80 m (260 ft)
Surface elevation 1,280 m (4,200 ft)

Waterton Lake is a mountain lake in southern Alberta, Canada and northern Montana, United States. The lake is composed of two bodies of water, connected by a shallow channel known locally as the Bosporus. The two parts are referred to as Lower Waterton Lake, and Upper Waterton Lake, the latter of which is crossed at the tip by the Canada–United States border. The United States Geological Survey gives the geocoordinates of 49°03′00″N 113°54′03″W / 49.05000°N 113.90083°W / 49.05000; -113.90083 for Upper Waterton Lake.

The northern, lower end of the main lake lies in Waterton Lakes National Park while the upper, southern part of the lake is located in Glacier National Park. In 1979, UNESCO established the Waterton Biosphere Reserve to protect the diverse habitats including prairie grasslands, aspen parkland, subalpine forests, alpine tundra and freshwater fens that surround the lake.

Waterton-Glacier International Peace Park was created by the US and Canada in 1932, and in 1976 it was designated an International Biosphere Reserve. Later, in 1995, it was inscribed as a World Heritage Site by UNESCO.


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