This ecoregion occupies the northwestern corner of New Brunswick and is bordered by the Saint John River valley to the west. The ecoregion is marked by warm, moist summers and snowy, cold winters. The mean annual temperature is approximately 3.5°C. The mean summer temperature is 14.5°C and the mean winter temperature is -7.5°C. The mean annual precipitation ranges 1000-1200 mm. The mixedwood forest is composed of closed stands of sugar maple, beech, and yellow birch on upland sites, whereas eastern hemlock, balsam fir, eastern white pine, and white spruce prevail in valleys. In the drier, northern part of the region, white, red and jack pine along with spruce and fir are more common. The ecoregion includes the Chaleur Uplands and lower elevations of the New Brunswick Highlands, ranging 200-500 m asl. The uplands have developed on folded sedimentary and igneous Palaeozoic strata. The Chaleur Uplands section of the region is remarkably uniform. The regularity of concordant summits is broken only by a few hills and ridges rising slightly above the general level; with increasing elevations to the east, the region becomes more rugged and dissected. The region is mantled with stony glacial deposits; bedrock outcroppings are significant. Loamy Humo-Ferric and Ferro-Humic Podzols are the dominant soils. There are significant inclusions of Gray Luvisols. The ecoregion provides habitat for moose, black bear, white-tailed deer, red fox, snowshoe hare, porcupine, fisher, coyote, beaver, ruffed grouse, bobcat, and marten. Shorebirds and seabirds inhabit the coast of Chaleur Bay. Forestry and some agriculture are major land uses. The major communities include Campbellton and Edmundston. The total population of the ecoregion is approximately 135 500.
This ecoregion is part of the Atlantic Maritime ecozone.