VASTERLING CREEK. Vasterling Creek rises four miles southeast of Castell in western Llano County (at 30°38' N, 98°56' W). Henry Vasterling and his family were among the first German immigrants who established the Castell settlement under the aegis of the Adelsverein in 1847. The stream follows a northeasterly course for 6½ miles to its mouth on the Llano River, four miles east of Castell (at 30°43' N, 98°53' W). It traverses an area of the Llano Basin characterized by flat to rolling terrain, locally dissected and covered with soils ranging from sandy to clay loams. Vegetation consists primarily of open stands of live oak and mesquite.