High Quality Content by WIKIPEDIA articles! Walla Walla (pronounced / w l w l / WOL- -WOL- , meaning "many rivers") is a Native American group from the northwestern United States.Many Walla Walla live on the Confederated Tribes of the Umatilla Indian Reservation. The Walla Walla share land and a governmental structure with the Cayuse and the Umatilla tribes as part of the Confederated Tribes of the Umatilla. The reservation is located in the area Pendleton, Oregon, United States, near the Blue Mountains.