There are multiple regions that comprise the coastline of The Gulf Of Mexico:

United States

• Southwest Florida — a region of Florida
• Gulf Coast (Alabama) — a region of Alabama
• Gulf Coast (Mississippi) — a region of Mississippi
• Gulf Coast (Louisiana) — a region of Louisiana
• Gulf Coast (Texas) — a region of Texas

Mexico

• Western Northern Mexico — a region of Northern Mexico
• Western Central Mexico — a region of Central Mexico
• Northern Yucatán and the South — a region of Yucatán and the South

Cuba

• Western Cuba — a region of Cuba