The Animas Valley is a lengthy and narrow north–south valley 85 miles long, located in western Hidalgo County, New Mexico, in the Bootheel Region; the extreme south of the valley lies in Sonora-Chihuahua, in the extreme north-west of the Chihuahuan Desert, the large desert region of the north-central Mexican Plateau and the Rio Grande valley and rive…The Animas Valley is a lengthy and narrow north–south valley 85 miles long, located in western Hidalgo County, New Mexico, in the Bootheel Region; the extreme south of the valley lies in Sonora-Chihuahua, in the extreme north-west of the Chihuahuan Desert, the large desert region of the north-central Mexican Plateau and the Rio Grande valley and river system.