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Lesser Slave Lake
SW Lesser Slave Lake.jpg
Southeast corner of the lake from Marten Mountain looking south with Dog Island, Devonshire Beach, and the Town of Slave Lake visible in the distance
Lesser Slave Lake is located in Alberta
Lesser Slave Lake
Lesser Slave Lake
Location in Alberta
Location Big Lakes / Lesser Slave River No. 124, Alberta
Coordinates 55°26′26″N 115°29′19″W / 55.44056°N 115.48861°W / 55.44056; -115.48861
Type Eutrophic
Primary inflows South Heart River, Swan River Driftpile River, Assineau River, Marten River
Primary outflows Lesser Slave River
Catchment area 13,900 km2 (5,400 sq mi)
Basin countries Canada
Max. length +100 km (62 mi)
Max. width 15 km (9.3 mi)
Surface area 1,168 km2 (451 sq mi)
Average depth 11.4 m (37 ft)
Max. depth 20.5 m (67 ft)
Water volume 13.69 km3 (11.10×10^6 acre⋅ft)
Shore length1 247 km (153 mi)
Surface elevation 578 m (1,896 ft)
Settlements Slave Lake, High Prairie, Alberta
1 Shore length is not a well-defined measure.


Lesser Slave Lake is located in central Alberta, Canada, northwest of Edmonton. It is the second largest lake entirely within Alberta boundaries (and the largest easily accessible by vehicle), covering 1,160 km2 (450 sq mi) and measuring over 100 km (62 mi) long and 15 km (9.3 mi) at its widest point. Lesser Slave Lake averages 11.4 m (37 ft) in depth and is 20.5 m (67 ft) at its deepest. It drains eastwards into the Athabasca River by way of the Lesser Slave River.

The town of Slave Lake is located at the eastern tip of the lake, around the outflow of Lesser Slave River.

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