LANG CREEK. Lang Creek, previously known as Bear Springs Branch, rises one mile east of the Llano county line in eastern Mason County (at 30°37' N, 98°58' W). The intermittent stream runs northeast for eight miles to its mouth on the Llano River, a mile east of Castell in Llano County (at 30°42' N, 98°56' W). Rising in limestone hills on the eastern edge of the Edwards Plateau, the creek crosses an area of the Llano Basin characterized by rolling to steep terrain surfaced by sandy and clayey loams, with shallow, stony soils in the steeper areas. Vegetation consists primarily of open stands of live oak and mesquite, scrub brush, and grasses.