Oregon is to the south, with the Columbia River forming the western part and the 46th parallel forming the eastern part of the Oregon-Washington border. Its northern border lies mostly along the 49th parallel, and then via marine boundaries through the Strait of Georgia, Haro Strait and Strait of Juan de Fuca, with the Canadian province of British Columbia to the north.

Washington is part of a region known as the Pacific Northwest, a term which always includes Washington and Oregon and may or may not include some or all of the following, depending on the user's intent: Idaho, western Montana, northern California, British Columbia, and Alaska.

Washington is the northwestern-most state of the contiguous United States.

Washington was named after President George Washington by an act of the United States Congress during the creation of Washington Territory in 1853.

The territory was originally to be named "Columbia", for the Columbia River and the Columbia District, but Kentucky representative Richard H.

It was admitted to the Union as the 42nd state in 1889. Washington is sometimes referred to as Washington State to distinguish it from Washington, D. Approximately 60 percent of Washington's residents live in the Seattle metropolitan area, the center of transportation, business, and industry along Puget Sound, an inlet of the Pacific Ocean consisting of numerous islands, deep fjords, and bays carved out by glaciers.

The remainder of the state consists of deep temperate rainforests in the west, mountain ranges in the west, central, northeast and far southeast, and a semi-arid basin region in the east, central, and south, given over to intensive agriculture.

Manufacturing industries in Washington include aircraft and missiles, shipbuilding and other transportation equipment, lumber, food processing, metals and metal products, chemicals, and machinery.

Washington has over 1,000 dams, including the Grand Coulee Dam, built for a variety of purposes including irrigation, power, flood control, and water storage.

Washington is the second most populous state on the West Coast and in the Western United States, after California.

Mount Rainier, an active stratovolcano, is the state's highest elevation at almost 14,411 feet (4,392 m) and is the most topographically prominent mountain in the contiguous United States. Its rugged surface is rich in stands of Douglas fir, hemlock, ponderosa pine, white pine, spruce, larch, and cedar.

), officially the State of Washington, is a state in the Pacific Northwest region of the United States.