PARRILLA CREEK. Parrilla Creek rises in two branches in western Duval County. Parrilla Creek North rises fourteen miles southwest of Freer (at 27°41' N, 98°42' W) and runs east for seven miles; Parrilla Creek South rises twenty-two miles west of Benavides (at 27°37' N, 98°46' W) and runs east for thirteen miles. Parrilla Creek proper is formed by the confluence of these two branches fourteen miles south of Freer (at 27°40' N, 98°37' W) and runs southeast for eight miles to its mouth on Agua Poquita Creek, nine miles west of Benavides (at 27°36' N, 98°33' W). The stream traverses flat terrain with local shallow depressions, surfaced by clay and sandy loams that support water-tolerant hardwoods, conifers, and grasses.