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Umatilla Indian Reservation | |
|---|---|
  Umatilla Indian Reservation Location in the United States | |
 Umatilla Indian Reservation Location in Oregon | |
| Tribe | Confederated Tribes of the Umatilla Indian Reservation |
| Country | United States |
| State | Oregon |
| County | Umatilla and Union |
| Headquarters | Mission |
| Area | |
| • Total | 702.01 km2 (271.047 sq mi) |
| Website | Confederated Tribes of the Umatilla Indian Reservation |
The Umatilla Indian Reservation is an Indian reservation in the Pacific Northwest of the United States. It was created by The Treaty of 9 June 1855 between the United States and members of the Walla, Cayuse, and Umatilla tribes. It lies in northeastern Oregon, east of Pendleton. The reservation is mostly in Umatilla County, with a very small part extending south into Union County. It is managed by the three Confederated Tribes of the Umatilla Indian Reservation.
Located on the north side of the Blue Mountains, the reservation was established for two Sahaptin-speaking Native American tribes: the Umatilla and Walla Walla, and for the Cayuse, whose language, now extinct, was an isolate. All the tribes historically inhabited the Columbia Plateau region. The tribes share land and a governmental structure as part of their confederation.