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The Willamette River is a tributary of the Columbia River. The name derives from a Clackamas Indian village name. The river is 187 miles (301 km) long, lying in northwestern Oregon. Flowing northward between the Oregon Coast Range and Cascade Range, the river and its tributaries form a basin called the Willamette Valley containing 70 percent of Oregon's population, including its largest city Portland, which sits along both sides of the river near its mouth on the Columbia.

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