The Great Slave Lake, named
after the Dene Slavey Indians, covers 10,980 square miles
(28,44 km2) in Nunavut, formerly the Northwest Territories
of Canada. The lake is 300 miles (483 km) long and
between 12 and 68 miles (19–110 km) wide, and it is the
deepest lake in North America at 2,015 feet (614.6 m) and
the sixth deepest in the world. The first European to discover
the lake was Samuel Hearne in 1771, and he named it
Athapuscow Lake. The Mackenzie River, the longest in
Canada—2,651 miles (4,241 km)—has its source in the
western end of the Great Slave Lake. The lake is located
along several geological boundaries, some marked by faults,
explaining its great depths. The south and western ends of
the lake are covering Devonian clastic rocks derived from
the mountains to the west, whereas the northern and eastern
ends of the lake cover Precambrian basement. The east
arm of the lake follows a Proterozoic rift basin, where spectacular
stromatolitic reefs are preserved, whereas the northern
side of the lake exposes Archean rocks of the Slave
province. The McDonald fault scarp strikes northeast along
the east arm of the lake.














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