Gulf of Mexico Gulf of Mexico The Gulf of Mexico () is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. The U.S. states of Texas, Louisiana, Mississippi, Alabama, and Florida border the Gulf on the north, which are often referred to as the "Third Coast", in comparison with the U.S. Atlantic and Pacific coasts. The Gulf of Mexico formed approximately 300 million years
Name of Mexico in Mexico City—the accepted name internationally—but the converse actually applies. Before Spanish times, the capital was formally named Tenochtitlan, but was the seat of the Mexica Empire which is known as the Aztec Empire. As far back as 1590, the Theatrum Orbis Terrarum showed that the northern part of the New World was known as "America Mexicana" (Mexican America), as Mexico City was the seat for the New Spain viceroyalty. New Spain is mistaken as the old name for Mexico, rather than the name of a large of expanse of land which covered much of North America and included the