The Devils River watershed covers parts of Schleicher, Crockett, Sutton, Edwards and Val Verde Counties. The surface water flows of the Devils River lie entirely within Val Verde County, originating near Juno, Texas and flowing approximately 60 miles south into the Rio Grande at Amistad Reservoir, ultimately providing water to the lower Rio Grande. In the upper stretches, flows are intermittent, but grow stronger as creeks and springs contribute to the river's flow along the way.

The maps below show the extent of the river and its water catchment area, as well as the ecoregions that the river runs through.

The Devils River Basin encompasses three unique biological regions - the Chihuahuan Desert, Edwards Plateau, and Tamaulipan Brush Country. Due to this convergence of ecoregions the Devils River Basin hosts an incredible diversity of wildlife.

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