The purpose of this report on the geology and ground-water resources of Comal County in central Texas is to determine the sources of the waters that supply Comal Springs, the largest springs in the Southwest, and other springs and wells. Comal County has an area of about 559 square miles and in 1950 had a population of 16,325. Comal Springs discharge within the city limits of New Braunfels, the county seat of Comal County.