The Pacific Northwest, also referred to as Cascadia, is a region on the west coast of North America. It refers to the northwestern corner of the United States and the southwestern part of Canada. The U.S. states of Washington, Oregon, Idaho and western Montana are in the southern part of the Pacific Northwest. The Canadian province of British Columbia and the southeastern part of the U.S. state of Alaska is in the northern part. The entire region is bordered by the Pacific Ocean to the west.