If you mean Oregon and Washington, you'd be looking for the Columbia River...
Columbia River
Colombia River
Columbia river
The river flowing between Washington and Oregon is the Columbia River.
The Columbia River.
Columbia river
The Columbia River
The Columbia River.
The Columbia river.
The Columbia River separates Washington and Oregon. It runs from British Columbia, Canada, through Washington state, and forms part of the border between Washington and Oregon before emptying into the Pacific Ocean.
Washington and Oregon border the Columbia River.