Ahtanum Ridge is a long anticline mountain ridge in Yakima County in the U.S. state of Washington. It is located just south of the city of Yakima, and much of its length is at the northern edge of the Yakama Indian Reservation.
Ahtanum Ridge separates Yakima Valley on the south from Ahtanum Valley on the north. At the eastern end of Ahtanum Ridge the Yakima River flows through Union Gap. The ridge continues east of Union Gap as the Rattlesnake Hills.
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