Major Geological Features of the U.S. Gulf Coastal Plains

The Gulf Coastal Plain stretches from Florida to Mexico. Key features:

1. Barrier Islands – Chains of sand (Dauphin Is., Galveston, South Padre) shielding mainland from storms.
2. Salt Domes – Upwelling salt pillars (e.g., Avery Island, LA) trapping oil/gas; source of Tabasco peppers.
3. Wetlands – Vast marshes/swamps: Mississippi Delta, Atchafalaya Basin, Everglades—critical habitat & flood buffers.
4. Karst Terrain – Sinkholes, caves, underground rivers (Mammoth Cave, KY—technically just north, but same karst belt).
5. Beaches – White-sand tourist magnets: Clearwater, Panama City, Gulf Shores; also sea-turtle nesting grounds.

These features shape ecology, economy (energy, tourism, fisheries), and hazard resilience.