On June 9th 1855, the Yakama reluctantly signed a treaty (which has never been upheld by the Federal Government) with the United States giving up approximately 17,000 square miles (or 91%) of their territory for 1500 square miles of reservation land in the desert of eastern Washington.
The Yakama Reservation is the largest Indian Nation in the northwest and one of the largest in the nation with approximately 10,000 enrolled members.
The area enjoys 300+ days of sunshine a year. The annual rainfall on the reservation (8 inches) is less than the evaporation rate.
The reservation is at the foot of snow-capped Mount Adams which is 12,307 feet tall.