1. The Northern Great Bear Plains HS (High Subarctic) Ecoregion occupies the northern third
of the Taiga Plains and contains 14 Level IV ecoregions.

Mackenzie Delta HS Ecoregion – Level IV
Looking southwest across the upper Delta toward the treeless British-Richardson Foothills and Mountains, east of Aklavik. The bright green patches are delta marshes. The Mackenzie Delta is the largest delta in Canada.

Campbell Hills HS Ecoregion – Level IV
Detail of black spruce-lichen vegetation on thin soils over bedrock, typical growing conditions on the Campbell Hills.

Great Bear Plain HS Ecoregion – Level IV
A meltwater channel carved deeply into Devonian limestone is an interesting feature in the western part of the Ecoregion.

2. The Central Great Bear Plains LS (Low Subarctic) Ecoregion occupies the middle third of the Taiga Plains; this Ecoregion contains 14 Level IV ecoregions.

Lac Grandin Plain LS Ecoregion
Deeply fluted terrain in the southwestern part of the Ecoregion supports relatively tall, diverse closed white spruce, trembling aspen and Alaska paper birch stands.

Ebbutt Upland HB Ecoregion – Level IV
Southwest slope of one of three major hills in the Ebbutt Upland HB Ecoregion with tall, diverse white spruce and trembling aspen forests.

Mossy spring, mid-slope on the most southerly hill within
the Ebbutt Upland HB Ecoregion. Groundwater seepage together with south-facing aspects supports good growth of mixed-wood forests on the slopes.

3. The Great Slave Uplands HB (High Boreal) Ecoregion occurs at higher elevations, or at slightly higher latitudes within the larger Mackenzie and Slave Lowlands Ecoregion; it contains six Level IV ecoregions.

Horn Plain HB Ecoregion
Relatively tall and diverse conifer-dominated forests are restricted mainly to narrow bands along stream channels; here, white spruce and willow shrub lands parallel a sluggish creek.

Trout Upland HB Ecoregion.
Peat plateaus and bogs with scattered islands of deciduous and mixed-wood forest are characteristic of the Trout Upland HB Ecoregion.

Great Slave Plain HB Ecoregion
Ground vegetation on highly calcareous beach ridge gravels; dwarf shrubs such as common bearberry and shrubby cinquefoil are dominant.

4. The Mackenzie and Slave Lowlands MB (Mid-Boreal) Ecoregion is a narrow belt across the southern third of the Taiga Plains and has the mildest climate in the Northwest Territories. This Ecoregion contains 11 Level IV ecoregions. It has the mildest climatic regime in the Taiga Plains.

Liard Plain MB Ecoregion
The Liard River (left), meander scrolls (curved features produced by river migration across the floodplain), and a mix of wet fens (light green) and productive mixed-wood floodplain forests (dark green and grayish tones), near Nahanni Butte.

Horn Slopes MB Ecoregion
Massive slope failures are common along the length of the Horn Slopes MB Ecoregion; groundwater seepage causes slope instability and produces mudslides like this one.

Slave Delta MB Ecoregion
The mouth of the Slave River Delta with Great Slave Lake at top of image; vegetation is dense willow-alder-birch shrubland in the foreground, with a sedge-dominated channel marsh in the
upper part of the image.