The Frio River rises from the juncture of the East, West, and Dry Frio
rivers (at 29°44′ N, 99°45′ W) and flows southeast, across central
Uvalde and Frio counties and northeastern LaSalle, northern McMullen,
and northwestern Live Oak counties, for 200 miles to its mouth on the
Nueces River, a mile south of Three Rivers (at 28°26′ N, 98°11′ W).
The Sabinal River rises in fissure springs that flow from great slabs of
limestone in the Lost Maples State Natural Area, seven miles north of
Vanderpool in northwestern Bandera County. It flows southeast to the
Balcones Escarpment, where its course changes to the east and then to
the west, and thence to its mouth on the Frio River, ten miles south of
Sabinal. The river is sixty miles long. In several places it sinks
underground to rise again downstream.
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