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The San Pedro River flows north from the Mexican state of Sonora into Arizona to join the Gila River, one of only two major rivers that flows north out of Mexico into the United States. It also is one of the last few large undammed large rivers in the Southwest. The river is 120 miles long. The headwaters of the San Pedro River originate from the high slopes of the Sierra La Mariquita, Sierra San Jose, and Sierra Los Ajos mountains in north central Sonora, Mexico. Flowing northward, the San Pedro River passes through the rolling semi-arid grasslands of the Chihuahuan Desert and Sonoran Desert into Arizona, where it enters a broad valley flanked by mountains on the east and west. The western mountain ranges within the United States include the Huachuca Mountains, the Whetstone Mountains and the Rincon Mountains. The eastern mountain ranges include the Mule Mountains, the Dragoon Mountains and the Galiuro Mountains.