Great Slave Lake is the second-largest lake in the Northwest Territories of Canada (after Great Bear Lake), the deepest lake in North America, and the tenth-largest lake in the world by area. It is 480 kilometres (300 miles) long and 19 to 109 kilometres (12 to 68 miles) wide. It has a maximum depth of 614 metres (2,015 feet), making it the deepest lake in North America. Its average depth is 75 metres (246 feet). The lake contains numerous islands, some of which are quite large.
Geography and Hydrology: Located in the southern part of the Northwest Territories, Great Slave Lake is fed by several rivers, including the Hay River, Slave River, and Taltson River. It is drained by the Mackenzie River, which flows north to the Arctic Ocean. The lake is a remnant of a larger post-glacial lake called Glacial Lake McConnell. The region surrounding the lake is characterized by boreal forest to the south and tundra to the north, with the Canadian Shield to the east and the Western Cordillera to the west.
Climate: The lake experiences a subarctic climate, with long, cold winters and short, cool summers. For eight months of the year, from late October to mid-June, the lake is typically frozen over, with ice thick enough in many areas to support the passage of heavy trucks. This makes the lake a vital part of the region's ice road network during winter months.
Ecology: Great Slave Lake supports a diverse ecosystem, including various fish species such as lake trout, northern pike, walleye, and whitefish, which are commercially harvested. It is also an important habitat for numerous bird species, particularly during migration periods. The surrounding forests and wetlands are home to various mammals, including caribou, moose, and bears.
Human History and Economy: Indigenous peoples have lived around Great Slave Lake for thousands of years. The Dene people, including the Tłı̨chǫ and Chipewyan, have a deep cultural and historical connection to the lake. European contact began in the late 18th century with fur traders. The discovery of gold near Yellowknife in the 1930s led to a significant population boom and the establishment of Yellowknife as the territorial capital, situated on the north shore of the lake. Other communities located on the lake include Hay River, Behchokǫ̀, Fort Resolution, and Łutselkʼe. Economic activities around the lake today include fishing, tourism, mining (historically gold and diamonds), and transportation.
Etymology: The lake's name originates from the Slavey (or Dehcho) people, an Athabaskan-speaking Indigenous group who historically inhabited its southern shores. Early European traders and explorers, using the nomenclature of the Cree people, referred to the Slavey as "Slave," which was a common, though now considered derogatory, term used to describe various Dene groups by their Cree rivals. The "Great" prefix distinguishes it from other smaller lakes or features associated with the same group.