The Agua Caliente Mountains are a small range in eastern Yuma and western Maricopa counties in southwest Arizona. The community of Hyder is on the north side of the range adjacent to the Union Pacific rail line and Hyder Road. The community of Agua Caliente lies on the south flank of the range and the Gila River lies to the south.Arizona Atlas & Gazetteer, DeLorme, Fourth Ed. 2001 p. 55
The highest point is Morris Peak at rising above the surrounding desert plain in the northwest part of the range in Yuma County.Hyder, Arizona 7.5 Minute Topographic Quadrangle, USGS, 1965
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