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physiography of British Columbia. British Columbia, the westernmost province in Canada, has a diverse physiography composed of the Cordillera and Great Plains Region.

The Cordillera in British Columbia consists of three broad units-the Western System, the Interior System of scattered plateaux and mountains, and the Rocky Mountain System in the east.

The Western System consists of:

(1) the Insular Mountains appearing in the Queen Charlotte Islands and Vancouver Island, and the St. Elias Mountains in the northwest corner of the province where Mt. Fairweather (4,663 metres), the highest peak, is found;

(2) the Coastal trough forming the east coastal plain of Vancouver Island and the delta plain of the Fraser River;

(3) the Coast Mountains which extend northwesterly and average 160 kilometres wide; and

(4) the Cascade Mountains which rise to the east and south of the Fraser River in the southeast corner of the Western System.

The Interior System is further inland and is dominated by the extensive Interior Plateau.

The southern section of the Interior Plateau is 50-65 kilometres wide and ranges between 1,200 and 1,800 metres above sea level.

It extends 800 kilometres in a northwesterly direction, broadening to 320 kilomeetres and ranging between 600 and 1,200 metres elevation in the northern section.

It is bordered on the east by the Columbia Mountains and the Rocky Mountain Trench, and on the west by the Coast and Hazelton Mountains.

The northern third of the Interior System, surrounded by a series of mountain systems, comprises the smaller Yukon and Stikine Plateaux.
The Rocky Moutain Trench runs in a northwesterly direction to the Yukon border from the southeast sector of the province.

It is 3 to 25 kilometres wide and contains a series of rivers and lakes as well as the Peace River reservoir (Lake Williston) and Mica reservoir (Kinbasket Lake).

The Rocky Mountain System forms the eastern wall of the Trench and separates the province of Alberta from British Columbia south of the 54th parallel.

Mt. Robson, reaching an elevation of 3,957 metres, is the highest peak in the British Columbia portion of the Rockies.

The northeast corner of the province east of the Rocky Mountains is a relatively flat region.

It is part of the Great Central Plains of North America.

The province has many rivers which rise in glacial and snowcapped mountains and drain the interior regions.

The Fraser and Columbia Rivers originate in the Rocky Mountain Trench and flow southwestward.

The Fraser enters the Pacific Ocean near Vancouver. The Columbia extends south of the border and reaches the ocean in the United States.

The Skeena River rises in north Central British Columbia, runs southwest and empties into the Pacific Ocean near Prince Rupert.

The Peace and Liard Rivers originate in the Rocky Mountain Trench and are tributaries of the Mackenzie River which flows north to the Arctic Ocean.

There are many large and beautiful lakes in the province.

Some of the largest natural ones include: Babine, Kootenay, Atlin, Stuart and Okanagan Lakes. Williston Lake, created behind Bennett Dam on the Peace River, is now the largest body of water in British Columbia.
Other large man-made (or enlarged) lakes include the Nechako reservoir, Kinbasket Lake and Arrow Lakes.

more information; Library: Canada Facts: British Columbia
mountains, British Columbia, island, rivers, interior, lakes, land, Pacific Ocean, Rocky Mountain, mountains rise, valleys, plateaus, southern interior, Coastal Mountains, Vancouver Island.
The average width, from the Pacific Ocean on the west to the province of Alberta on the east, is about 640 kilometres.
It is the largest island on the coast of the Americas.
East of the Coastal Mountains rolling upland forests, as well as natural grasslands and lakes predominate.
The Cariboo plateau is a series of high plateaus and rolling ranchland, while the southern interior is made up of lush and fertile valleys that produce fruits and vegetables.
The Rocky Mountain Trench lies between the Rockies and the Interior System.
Lakes and rivers dominate the interior valleys of British Columbia. aezclass-21
river, lakes, mountains, Columbia, concentrations, watersheds, reservoir, streams, Quesnel, trench, Rocky Mountains, TDS, sediment, Dam, Shuswap.
The Southern Interior Mountains includes Quesnel Highlands, the Columbia Mountains, Purcell Range, Shuswap Highlands, and Southern Rocky Mountains all located in the southeastern part of B.C.
All these reservoirs are river impoundments and all are in the Columbia River watershed.
The Rocky Mountain Trench leads north to the Nechako lowlands and to the south in penetrates well into Montana.
Although originally deep, the trench filled in with moraine and other erosional debris during and after glaciation, forming a wide valley that now is the flood plain for upper reaches of the Columbia and Fraser watersheds.
Median TDS is 36 mg·L-1 (Murtle Lake watershed) to 96 mg·L-1 (Columbia Reach of Kinbasket Reservoir) in the Quesnel Highlands lakes and 60-142 mg·L-1 in lakes of the Shuswap area. Distribution and occurrence
western snowberry, wheatgrass, forest, pine, Mountain, habitat type, fescue, prairie, common, sagebrush, ponderosa, Black Hills, plains, American, North Dakota.
Western snowberry is common in floodplain and riparian habitats.
In Montana western snowberry is found along the floodplain of the Yellowstone River.
A green ash/western snowberry habitat type has been described.
Western snowberry often forms dense monotypic stands with little understory.
Some common understory species include rough fescue (Festuca scabrella), Kentucky bluegrass (Poa pratense), and western wheatgrass (Pascopyrum smithii).
Western snowberry is an important species in native shortgrass and mixed-grass prairies of the northern Great Plains.

Columbia Basin, grasses, zones, Mountains, biogeoclimatic zones, Interior, Rocky Mountains, River system, lake, British Columbia, Spruce, slopes, alpine, forests, Cordilleran.
The Columbia Basin region, as described in this treatment, and represented by the Living Landscapesprogram (Figure 1a) is bounded to the west by the ridge line of the Monashee and Columbia Mountains and to the south by the Canada/U.S.
On the eastern boundary is the British Columbia/Alber-ta border through the Rocky Mountains and the northern limit is at Valemont.
The region falls within the Southern Cordilleran and the Interior Cordilleran Ecoclimatic zones.
Grasses of the biogeoclimatic zones According to the biogeoclimatic () mapping of forested ecosystems (Meidinger and Pojar, 1991) there are seven biogeoclimatic zones (Figure 1b), located in the Living Landscapesstudy area of the Columbia Basin region.

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