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The Pacific Northwest ( PNW ), sometimes referred to as Cascadia, is a geographic region in Western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Though no official boundary exists, the most common conception includes the U.S. states of Oregon, Washington, northern ...
The Northwestern United States, also known as the American Northwest or simply the Northwest, is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, Idaho, Montana and Wyoming. Some sources include Southeast Alaska in the Northwest. The related but distinct term "Pacific ...
The inland and intracoastal waterways of the eastern United States. The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters. Much of the commercially important waterways of the United States consist of the Mississippi River System —the Mississippi River and connecting waterways.
The Columbia River Gorge is the only major break of the range in the United States. When the Cascades began to rise 7 million years ago in the late Miocene, the Columbia River drained the relatively low Columbia Plateau. As the range grew, erosion from the Columbia River was able to keep pace, carving out the gorge and major pass seen today.
The Northwest Territory, also known as the Old Northwest [a] and formally known as the Territory Northwest of the River Ohio, was formed from unorganized western territory of the United States after the American Revolution. Established in 1787 by the Congress of the Confederation through the Northwest Ordinance, it was the nation's first post ...
Map of the Inland Northwest. Counties highlighted in red are always included, while counties highlighted in pink are sometimes included. The Inland Northwest, historically and alternatively known as the Inland Empire, is a region of the American Northwest centered on the Greater Spokane, Washington Area, encompassing all of Eastern Washington and North Idaho.
Columbia Plateau. Coordinates: 45°59′58″N 119°00′05″W. The Columbia Plateau covers much of the Columbia River Basalt Group, shown in green on this map. The Washington cities of Spokane, Yakima and Pasco, and the Oregon city of Pendleton, lie on the Columbia Plateau. The Columbia Plateau is a geologic and geographic region that lies ...
The Snake River is a major river in the interior Pacific Northwest region of the United States. About 1,080 miles (1,740 km) long, it is the largest tributary of the Columbia River, which is the largest North American river that empties into the Pacific Ocean. Beginning in Yellowstone National Park, western Wyoming, it flows across the arid ...