In the United States, Interior Salish people inhabited the Columbia River and its tributaries above Priest Rapids, near present-day Mattawa. Sahaptin people inhabited the Columbia River and its tributaries between Priest Rapids and Celilo Falls near the Dalles, Oregon and up the Snake River to near the Washington - Idaho border. The Nez Perce inhabited the Clearwater and Salmon River basins and the Snake river through Hells Canyon. The Cayuse homeland is the Blue Mountains and the valleys of the rivers that flow from them. The Molala inhabited the eastern side of the cascade mountains in Oregon. The Klamath people inhabited the upper Klamath River basin and had close contact with people from the California cultural area, though their lifestyle and language were more characteristic of plateau culture.