The large Caribbean island that guards the mouth of the Gulf of Mexico is Cuba. Located to the south of the United States and east of Mexico, Cuba is the largest island in the Caribbean. Its strategic position makes it a significant geographical landmark for maritime navigation in the region.
Havana is the capital of the Republic of Cuba, a large island south of Florida, between the Gulf of Mexico and the Caribbean Sea.
Yucatan Peninsula.
Caribbean hope this helps :)
puerto rico
Trinidad
Both the Gulf of Mexico and the Caribbean Sea.
Cuba is the closest island from the West Indies to Mexico.
Corsica is a large island in the Mediterranean sea.
Cuba is the closest island from the West Indies to Mexico.
Cozumel is the large Island just east of Cancun, Mexico.
The large Caribbean island of Hispaniola has two countries: Haiti on the Western end and the Dominican Republic on the Eastern end.
Hispaniola!