Gulf Coastal Plain

The Gulf Coastal Plain extends around the Gulf of Mexico in the Southern United States and eastern Mexico.

The plain reaches from the western Florida Panhandle, the southwestern two thirds of Alabama, over most of Mississippi, some of western Tennessee and Kentucky, southwest Arkansas, the Florida Parishes of Louisiana, the southeast corner of Oklahoma, and easternmost Texas in the United States. It continues along the Gulf in northeastern and eastern Mexico, through Tamaulipas and Veracruz to Tabasco and the Yucatán Peninsula on the Bay of Campeche.

Geography

The Gulf Coastal Plains southern boundary is the Gulf of Mexico in the U.S. and the Sierra Madre de Chiapas in Mexico. Its western boundary is the drop into the Mississippi embayment (Mississippi Alluvial Valley) in the U.S. and the Sierra Madre Oriental in Mexico. On the north it extends to the Ouachita Highlands of the Interior Low Plateaus and the southern Appalachian Mountains. To the east, there is an arbitrary break with the South Atlantic Coastal Plain at...
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