The Jornada Del Muerto Basin, east of the Rio Grande Valley, covers approximately 3,344 mi² and at it's widest is nearly 12 miles across. It is bordered by Point of Rocks and the Caballo mountains in the west, the Dona Ana, San Diego, and Tortugas mountains in the southwest, and the Organ and San Andreas mountains in the east. The Jornada shares a subsurface Tertiary volcanic boundary with the Mesilla Basin. There is not any evidence that the Rio Grande has ever flowed across the Jornada Del Muerto. Recharge into the Jornada comes from precipitation and infiltration of mountain runoff and through major arroyos.
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