There are many rivers that create state boundaries in the United States. The river that separates Washington from Oregon is the Columbia River.
culombia river
Columbia River, Oregon.
The Snake River forms part of Oregon's eastern border
Columbia river
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Columbia river
The Columbia River forms a border between the states of Washington and Oregon.
The Columbia River lies between the States of Washington and Oregon, and forms the border between the two.
The Columbia River.
The Columbia River.
The Columbia River.
The Columbia River forms most of the border between Oregon and Washington before flowing into the Pacific Ocean.The river that forms part of the border between two northwestern states and flows into the pacific ocean is the Columbia river.
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