The climate and physiography of the Texas coastal zone.

Physiographers (i.e. Fenneman and Johnson, 1946) have classified the entire Coastal Zone of Texas as a part of the West Gulf Coast Section of the Coastal Plains Province. The immediate Coastal Zone is almost uniformly flat and low with a gradual increase both in height and relief to the north and west. The Coastal Plains Province terminates abruptly at the Balcones Escarpment which generally follows a Del Rio-San Antonio-Austin line. North of Austin the transition is less abrupt, but follows a line from Austin through Dallas to the Ouachita Mountains of Oklahoma.