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The Salt River (O’odham [Pima]: Onk Akimel) is a stream in the U.S. state of Arizona. It is the largest tributary of the Gila River. The river is about 200 miles long.The Salt River is formed by the confluence of the White River and Black River in the White Mountains of eastern Gila County. The White and Black Rivers, and other tributaries of the upper Salt River, drain the region between the Mogollon Rim in the north and the Natanes Mountains and Natanes Plateau to the east and south. Tributaries of the Salt River also drain the Sierra Ancha and Mazatzal Mountains. The White and Black Rivers drain the White Mountains in the Fort Apache Indian Reservation. The Salt River, along with the Black River, forms the boundary between the Fort Apache Indian Reservation to the north and the San Carlos Apache Indian Reservation to the south.