Pacific Northwest includes all of Oregon , Washington , and Idaho , and western Montana . The region varies greatly. Part of the Rocky Mountain system stands in the east, in Montana, Idaho, and Washington. The well-populated Willamette Valley of Oregon and the Puget Lowland of Washington are located to the west. In the middle lies the Columbia Plateau of Idaho, Oregon, and Washington. The Pacific Northwest is a major source of forest products, fruits, grain, minerals, and potatoes.
