Tags: Mountain Range.
For other uses of Black Hills see Black Hills (disambiguation); for the other mountain range in Arizona see: Black Hills (Yavapai County)The Black Hills of Greenlee County are a 20 mi (32 km) long mountain range of the extreme northeast Sonoran Desert bordering the south of the White Mountains of eastern Arizona’s transition zone.The mountain range is bordered by the Gila River and the range is a large block that forces the Gila to flow northwest west southwest; at the west the Gila River begins an excursion northwest at the start of the Gila Valley where Safford and Thatcher lie in the valley.The southwest quarter of the mountain range lies in the southeast of Graham County.