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SANTO TOMAS CREEK. Santo Tomas Creek rises twenty-one miles west of Callaghan in central Webb County (at 27°52' N, 99°45' W) and runs south for twelve miles to its mouth on the Rio Grande, sixteen miles northwest of Laredo (at 27°43' N, 99°45' W). The surrounding rolling hills and flat terrain have locally shallow depressions and are surfaced by clay and sandy loams that support scrub brush, mesquite, cacti, grasses, and water-tolerant hardwoods.

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"SANTO TOMAS CREEK," Handbook of Texas Online (, accessed November 30, 2015. Uploaded on June 15, 2010. Published by the Texas State Historical Association.