The Taiga Shield Ecozone, as defined by the

Commission for Environmental Cooperation The Commission for Environmental Cooperation (CEC; ; ) is an intergovernmental organization established by Canada, Mexico, and the United States to implement the North American Agreement on Environmental Cooperation (NAAEC), the environmental si ...

(CEC), is an

ecozone An ecozone may refer to: * Biogeographic realm, the broadest biogeographic division of Earth's land surface (referred to as ''ecozone'' by BBC) * Biome, a large collection of flora and fauna occupying a major habitat * Bioregion, an ecologically ...

which stretches across Canada's subarctic region. Some regions exhibit exposed

Precambrian The Precambrian ( ; or pre-Cambrian, sometimes abbreviated pC, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of t ...

bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bed ...

of the

Canadian Shield The Canadian Shield ( ), also called the Laurentian Shield or the Laurentian Plateau, is a geologic shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks. It forms the North American Craton (or Laurentia), th ...

, the oldest of the world's geological formations. The world's oldest rocks, dating to four billion years, are found in the Canadian Shield north of

Great Slave Lake Great Slave Lake is the second-largest lake in the Northwest Territories, Canada (after Great Bear Lake), List of lakes by depth, the deepest lake in North America at , and the List of lakes by area, tenth-largest lake in the world by area. It ...

Geography

The Taiga Shield ecozone covers almost all of the eastern area of the

Northwest Territories The Northwest Territories is a federal Provinces and territories of Canada, territory of Canada. At a land area of approximately and a 2021 census population of 41,070, it is the second-largest and the most populous of Provinces and territorie ...

, a tiny corner of northeastern

Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...

, a narrow strip of all northern

Saskatchewan Saskatchewan is a Provinces and territories of Canada, province in Western Canada. It is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, to the northeast by Nunavut, and to the south by the ...

and northwestern

Manitoba Manitoba is a Provinces and territories of Canada, province of Canada at the Centre of Canada, longitudinal centre of the country. It is Canada's Population of Canada by province and territory, fifth-most populous province, with a population ...

, as well as all some parts of southern

Nunavut Nunavut is the largest and northernmost Provinces and territories of Canada#Territories, territory of Canada. It was separated officially from the Northwest Territories on April 1, 1999, via the ''Nunavut Act'' and the Nunavut Land Claims Agr ...

. Here, it is interrupted by

Hudson Bay Hudson Bay, sometimes called Hudson's Bay (usually historically), is a large body of Saline water, saltwater in northeastern Canada with a surface area of . It is located north of Ontario, west of Quebec, northeast of Manitoba, and southeast o ...

, where it abuts with the marine ecozone of the

Arctic Archipelago Marine The Arctic Archipelago Marine Ecozone, as defined by the Commission for Environmental Cooperation (CEC), is a marine ecozone in the Canadian Arctic, encompassing Hudson Bay, James Bay, the internal waters and some shores of the islands in the Cana ...

, and resumes on the eastern shores of Hudson Bay on the coast of Quebec, where it continues in a consistently-wide strip towards the ocean, encompassing all but a small portion of

Labrador Labrador () is a geographic and cultural region within the Canadian province of Newfoundland and Labrador. It is the primarily continental portion of the province and constitutes 71% of the province's area but is home to only 6% of its populatio ...

. It is one of the largest ecozones in Canada, covering 1.3 million square kilometres. Terrain is typically flat or rolling hills with thousands of depressions carved by

glacial retreat The retreat of glaciers since 1850 is a well-documented effect of climate change. The retreat of mountain glaciers provides evidence for the rise in global temperatures since the late 19th century. Examples include mountain glaciers in western ...

now infilled, forming

lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...

pond A pond is a small, still, land-based body of water formed by pooling inside a depression (geology), depression, either naturally or artificiality, artificially. A pond is smaller than a lake and there are no official criteria distinguishing ...

wetland A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor ( anoxic) processes taking place, especially ...

s and other water features. Long

esker An esker, eskar, eschar, or os, sometimes called an ''asar'', ''osar'', or ''serpent kame'', is a long, winding ridge of stratified sand and gravel, examples of which occur in glaciated and formerly glaciated regions of Europe and North Amer ...

s and

upland Upland or Uplands may refer to: Geography *Hill, an area of higher land, generally *Highland, an area of higher land divided into low and high points *Upland and lowland, conditional descriptions of a plain based on elevation above sea level *I ...

s are also common.

Ecoprovinces

This ecozone can be further subdivided into four ecoprovinces: * Eastern Taiga * Labrador Uplands * Western Taiga Shield * Whale River Lowland

Settlements

Primarily

wilderness Wilderness or wildlands (usually in the plurale tantum, plural) are Earth, Earth's natural environments that have not been significantly modified by human impact on the environment, human activity, or any urbanization, nonurbanized land not u ...

, the Taiga Shield is sparsely populated, with approximately 340,000 inhabitants, over 60% of which is

First Nations First nations are indigenous settlers or bands. First Nations, first nations, or first peoples may also refer to: Indigenous groups *List of Indigenous peoples *First Nations in Canada, Indigenous peoples of Canada who are neither Inuit nor Mé ...

. Most settled areas developed around

mining Mining is the Resource extraction, extraction of valuable geological materials and minerals from the surface of the Earth. Mining is required to obtain most materials that cannot be grown through agriculture, agricultural processes, or feasib ...

hydroelectric Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

activity, for example in

Yellowknife Yellowknife is the capital, largest community, and the only city in the Northwest Territories, Canada. It is on the northern shore of Great Slave Lake, about south of the Arctic Circle, on the west side of Yellowknife Bay near the outlet of t ...

and

Uranium City Uranium City is a northern settlement in Saskatchewan, Canada. The community is at the mouth of Fredette River on Martin Lake. It is north of Lake Athabasca and Beaverlodge Lake and is about northwest of Prince Albert, Saskatchewan, northeast ...

in the west and

Labrador City Labrador City is a town in western Labrador (part of the Provinces and territories of Canada, Canadian province of Newfoundland and Labrador), near the Quebec border. With a population of 7,412 as of 2021, it is the second-largest population cent ...

in the east, but are isolated from other communities. Mineral extraction is the most important economic activity, with

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

being mined in Quebec and Labrador,

uranium Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Ura ...

in Saskatchewan, and

gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...

and more recently

diamond Diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond is tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of e ...

s in the Northwest Territories.

Climate

This subarctic zone experiences cool summers that are short, with at least 24 hours of full daylight a year in its most northern reaches, and winters that are extremely cold and long, with at least one 24-hour period of complete darkness. Precipitation ranges from 250 to 500 mm (10-20 in.) annually throughout the zone, except in Labrador which may receive up to 800 mm (31 in.) along its coast, and typically increases from west to east. The shallow

soil Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, water, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from ''soil'' by re ...

s remain damp, even soggy, year-round, and regularly freeze and thaw without drainage. This leads to shifting soil that randomly tilts growing trees, which has been likened to a " drunken forest".

Conservation

A number of

protected area Protected areas or conservation areas are locations which receive protection because of their recognized natural or cultural values. Protected areas are those areas in which human presence or the exploitation of natural resources (e.g. firewood ...

s have been established to protect representative and/or significant portions of this ecozone. These include Caribou River Wilderness Provincial Park, Sand Lakes Provincial Park, and

Thaidene Nëné National Park Reserve Thaidene Nene National Park Reserve (from the Dene, this Chipewyan name means ''land of our ancestors'') is a national park in the vicinity of the east arm of Great Slave Lake, located on the northern edge of the boreal forest of Canada in the N ...

References

{{Authority control Taiga and boreal forests Ecozones and ecoregions of the Northwest Territories Ecozones and ecoregions of Nunavut Ecozones and ecoregions of Quebec Ecozones and ecoregions of Manitoba Ecozones and ecoregions of Saskatchewan Ecozones and ecoregions of Newfoundland and Labrador