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Pacific Northwest
Cascadia
Seattle Kerry Park Skyline.jpg
Palouse fields, Washington from Kamiak Butte.jpg Snow covered mountains at Crater Lake (Unsplash).jpg
Vancouver ib.jpg
Black Tusk 1983.jpg Cannon Beach (4947305591).jpg
Portland and Mt Hood.jpg
Left-right from top: Seattle skyline and Mount Rainier, the Palouse, Crater Lake, Vancouver skyline, the Black Tusk, Cannon Beach, Portland skyline
Composition
Largest metropolitan areas
PacNW satellite
Satellite view of the Pacific Northwest

The Pacific Northwest is a region on the west coast of North America. It refers to the northwestern corner of the United States and the southwestern part of Canada. The U.S. states of Washington, Idaho, western Montana, Oregon and northern California are in the southern part of the Pacific Northwest. The Canadian province of British Columbia and the southeastern part of the U.S. state of Alaska is in the northern part. The entire region is bordered by the Pacific Ocean to the west.

Historically, the Pacific Northwest had many Native Americans. Starting from about 15,000 years ago, Native Americans settled along the coastline and along the major rivers. From the 1500s to the 1700s, Europeans explored the region, beginning with the discovery of Oregon and Washington. In the early 1800s, the famous Lewis and Clark expedition arrived in Washington State. From the 19th century to present day, the region began to become settled. Today, the largest cities in the Northwest include Vancouver, Seattle and Portland.

The rugged mountains of the Northwest consist of the Coast Range, which is nearer the coast, and the Cascade Range. In northern Washington, the Cascade Range is called the North Cascades. In British Columbia, it is called the Canadian Cascades. The many rivers of the Northwest result from its wet climate - the mountains trap wet Pacific air, leaving little rain for inland states like Idaho. The rivers once supported large salmon runs, but large power dams have been built on many rivers.

The main language of the Pacific Northwest is English in the United States and French in Canada; among the Native Americans Chinook Jargon is common. Among the many Asian immigrants, Chinese is being used more in the Northwest.

Geography

The Pacific Northwest basically extends from southeastern Alaska to Northern California. Along this entire length, is a large mountain range, the Cascade Range, that forms the geographic spine of the Pacific Northwest. The highest mountain in the Northwest is Mount Rainier. Rainier is 14,410 feet (4,390 m) high. Other notable mountains include Mount Shasta, at 14,163 feet (4,317 m), and Mount Baker, at 10,781 feet (3,286 m). East of the Cascades, there is the Columbia Plateau, a high area of land that stretches east to the Rocky Mountains in Idaho and Montana. In the west, the Coast Range borders the coast more closely. The Olympic Mountains are on the Olympic Peninsula, an extension of Washington State. Puget Sound is a large system of bays and straits in northwestern Washington and southeastern British Columbia.

The main rivers of the Pacific Northwest are the Fraser River, the Columbia River, and the Snake River. The Fraser River is mainly in British Columbia; it flows west to the Pacific Ocean near Vancouver. The Fraser drains most of the southern Canadian Cascades. The Columbia River begins in the Canadian Cascades and flows south, then turns west where it meets the Snake River. From there, it flows on to the ocean near Portland. The Snake River is mainly in inland Idaho. After a journey west from the Rocky Mountains, it meets the Columbia at Kennewick, Washington.

Other rivers in the Northwest include the Finlay, the Skagit, the Umpqua, the Rogue, and the Klamath. The Finlay drains the northern Canadian Cascades and flows on to join the Mackenzie River, which flows through Canada to Hudson Bay. The Skagit also begins in the Canadian Cascades, and crosses into Washington; it turns west and flows into the sea north of Everett, Washington. The Umpqua River begins in the Southern Oregon Cascades, and flows west to the Pacific Ocean near Reedsport, Oregon. The Rogue parallels the Umpqua and dumps into the sea at Gold Beach, Oregon. The Klamath flows south from a valley in inland Oregon, then turns west through northern California, cutting through the Cascade Range to its mouth near Klamath, California.

Climate

The main general climatic types of the Pacific Northwest are temperate: both moderate and four seasons, but mountainous and arid climates occupy much of the less inhabited or inland areas of the region. An oceanic climate occurs in most coastal areas, typically between the ocean and high mountain ranges. An Alpine climate dominates in the high mountains. Semi-arid and arid climates are found east of the higher mountains, especially in rainshadow areas. The Harney Basin of Oregon is an example of arid climate in the Pacific Northwest. Humid continental climates occur inland on windward sides, in places such as Revelstoke, British Columbia. A subarctic climate can be found farther north, especially in Yukon and Alaska.

Under the Köppen climate classification, a warm-summer version of the dry-summer mediterranean (Csb) designation, is assigned to many areas of the Pacific Northwest as far north as central Vancouver Island and the Gulf Islands, including cities such as Victoria, Vancouver (coast area), Seattle and Portland. These zones are not associated with a typical dry-summer climate, and would be classified as marine west coast (Cfb), except dry-summer patterns typical to the Pacific Northwest meet Köppen's minimum Cs thresholds. Other climate classification systems, such as Trewartha, place these areas firmly in the oceanic zone (Do).

Because of summer air dryness and low humidity, many of the main cities of the region have Mediterranean climates. The lack of rain in the hot season is associated with high atmospheric pressure. The shadows of the mountains also greatly decrease the amount of precipitation. West of the Cascades, the marine climates have a much greater precipitation than the west coast of Europe due to orographic lift, with some regions seeing as much as 3,500 mm (138 in) of precipitation per year. Winters are very mild for the region's latitude. The growth of Arbutus, a broad-leafed tree is possible on Vancouver Island, due to the mild winters.

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