This ecoregion covers the forested plain and wetland complex of northern and eastern Graham Island. Elevation varies up to 300 m asl. The mean annual temperature is approximately 7.5°C with a summer mean of 11.5°C and a winter mean of 3.5°C. Mean precipitation is approximately 1500 mm per year. Vegetative cover of this ecoregion is characterized by wetlands in association with open western hemlock, shore pine, and amabilis fir. Drier sites support stands of western hemlock, western red cedar, and Sitka spruce. The lowland is formed of gently sloping Tertiary sedimentary strata covered by glacial till, organic deposits and thick outwash deposits. Mesisols and Fibrisols are the dominant organic soils. Gleysolic and Podzolic soils with thick organic surface horizons are dominant mineral soils in the ecoregion. Many of the Podzols contain impermeable subsurface horizons which inhibit vertical soil drainage and enhance the moisture status of these soils. Wetlands cover much of the ecoregion. The predominant wetland forms are slope, basin, and shore bogs with localized stream fens and estuaries. Characteristic wildlife includes black-tailed deer (introduced), black bear, elk (introduced), otter, seabirds, shorebirds, and marine mammals. Dominant uses of land include forestry, recreation, and tourism. Much of the ecoregion is covered by Naikoon Provincial Park. Masset, Queen Charlotte, and Port Clements are the main communities. The population of the ecoregion is approximately 3000.
This ecoregion is part of the Pacific Maritime ecozone.