The Taiga Plain Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a Canadian terrestrial ecozone that covers most of the western Northwest Territories, extending to northwest Alberta, northeast British Columbia and slightly overlapping northeastern Yukon.

[3] To its south are the Boreal Plains, a vast forest of spruce and other timber with numerous wetland habitats.

[4] The ecozone consists primarily of strata of limestone, shale, and sandstone sedimentary rocks,[5] and has formed wide flat plains with rolling terrain throughout.

[6] The western portion, dominated by the Mackenzie, is more rugged with deep canyons and trenches cut by the river and tributaries.

This ecozone can be further subdivided into three ecoprovinces:[7] Summers are cool and short in this sub-arctic climate, with mean temperatures ranging from 7 °C in the north to 14 °C in the south.