The dotted lines on this map show the Camino Real (Royal Road) and crossings on the Medina River just southwest of San Antonio. Spanish explorers and missionaries traveled on this important transportation and commerce corridor stretching from San Antonio to points along the Rio Grande River. Drawn in 1764 by Menchaca, the map illustrates the locations of the missions in the San Antonio area, in the province of Texas. Mapa del Presidio de San Antonio de Bexar, courtesy John Carter Brown Library, Brown University.