This ecoregion extends northward from the North Arm of Great Slave Lake to Lac la Martre. It includes the northeastern one-third of Great Slave Plain, which is composed of low-relief Palaeozoic carbonates. Low scarps of resistant carbonate rock and shallow lakes are characteristic of its surface below about 300 m asl elevation. The mean annual temperature is approximately -6°C. The mean summer temperature is 11.5°C and the mean winter temperature is -25°C. The mean annual precipitation ranges 225-300 mm. The ecoregion is classified as having a low subarctic ecoclimate. It is dominated by open stands of black spruce with an understory of dwarf birch, Labrador tea, lichen, and moss. Drier and warmer sites tend to have more white spruce, paper birch, and some aspen. Wet sites are usually covered with bog-fen vegetation such as dwarf black spruce, Labrador tea, ericaceous shrubs, and mosses. Wetlands cover over 50% of the region. Turbic and Organic Cryosols with some Organic (Fibrisols), Luvisols, and Dystric Brunisols developed on level to hummocky morainal and organic deposits are the dominant soils. Permafrost is discontinuous throughout the ecoregion. Characteristic wildlife includes caribou, moose, black bear, red and arctic fox, snowshoe hare, muskrat, spruce grouse, raven, and waterfowl. Hunting and trapping, outdoor recreation, and tourism are the main land use activities. The principal community is Lac la Martre. The population of the ecoregion is approximately 400.
This ecoregion is part of the Taiga Plains ecozone.