Countries Bordering the Gulf of Mexico: None in South America

No South American countries border the Gulf of Mexico. The Gulf of Mexico is a basin of the Atlantic Ocean bordered exclusively by:

• United States (Florida, Alabama, Mississippi, Louisiana, Texas)
• Mexico (Tamaulipas, Veracruz, Tabasco, Campeche, Yucatán, Quintana Roo)
• Cuba (at its southeastern extent)

South America lies far to the southeast, separated by the Caribbean Sea and the Isthmus of Panama. The confusion may arise from the Gulf's proximity to Central America, but no South American nation has a Gulf of Mexico coastline.