The Columbia
The Columbia River is the major river in Washington.
That would be the River Nile.
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The Potomac River surrounds Washington D.C. It is also the fourth largest river along the Atlantic coast and twenty-first largest in the United States.
The largest geographic area in eastern Washington is the Columbia Plateau, which covers much of the region and extends into Idaho and Oregon. The plateau is characterized by rolling hills, basalt cliffs, and fertile farmland, making it an important agricultural region in the state.
Mount Washington
The eastern tributary of the Mississippi river is the Arkansas River. The Arkansas River is 1,460 miles long and is the second largest tributary to the Mississippi River system.
In Eastern Washington in the United States
Potomac River
The Columbia River divides Washington and Oregon. The Columbia River is the largest river, at 1,240 miles, that flows into the Pacific Ocean.
The Columbia River is by far the longest and largest, being the fourth largest river in the North America. It has many major rivers that contribute to is, such as the Yakima River and Snake River (much of which is in Idaho), but its two largest tributaries are not in Washington, but rather Oregon and British Columbia.
washington county,eastern wisconsin, U.S.A.