Sahaptin: marked dialectal diversity spoken along the Columbia River and adjacent Plateau in eastern Oregon and Washington. Southern Sahaptin (or “River”) varieties were originally spoken along the Columbia River from the Dalles to the Umatilla River, and included Tenino, Wayam, and Umatilla. Northwest Sahaptin varieties were spoken in the Yakima River drainage and included Klickitat, Taitnapam, Upper Nisqually, Yakima, and Kittitas. Northeast Sahaptin varieties were spoken on the Columbia River above Southern Sahaptin and along the lower Snake River, and included Walla Walla, Wanapam, and Palouse.