They are drained on the west by the Rio Medio, the Rio Quemado, and the Rio de las Trampas; on the northeast by the Rio Santa Barbara; and on the southeast by small creeks that quickly run into the upper reaches of the Pecos River.
The area is drained by the Rio Medio, Rio Quemado, and Rio de las Trampas to the west; the Rio Santa Barbara to the northeast; and small creeks that flow into the upper Pecos River to the southeast.