The Columbia River borders most of the length between Washington & Oregon.
The Columbia River.
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.
Potomac River
The Columbia River separates Washington State and Oregon.
Columbia River
columbia river
Its the Columbia River.
The Columbia River
The Columbia River is the border for most of Oregon/Washington states.