[Answer] What river forms most of the border between Oregon and Washington?

Step 1 : Introduction to the question "What river forms most of the border between Oregon and Washington?"

...1. Columbia River 2. Colorado River 3. Missouri River 4. McKenzie River

Step 2 : Answer to the question "What river forms most of the border between Oregon and Washington?"

Columbia River - Oregon is separated from Washington by the Columbia River. The 1,243-mile river flows from the northwest to the south of Washington before turning west along the border with Oregon, where it empties into the Pacific Ocean near Astoria. As the fourth-largest river by volume in the U.S., the Columbia has a drainage basin that extends into seven states and Canada. In fact, it drains more water into the Pacific than any other river in the Americas. Providing drinking water and irrigation for farmland, the Columbia has historically fueled the Pacific Northwest’s economy and was once home to one of the world’s largest salmon runs.:

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