Gulf of Mexico numerous bays and smaller inlets. A number of rivers empty into the gulf, most notably the Mississippi River and Rio Grande in the northern gulf, and the Grijalva and Usumacinta rivers in the southern gulf. The land that forms the gulf's coast, including many long, narrow barrier islands, is almost uniformly low-lying and is characterized by marshes and swamps as well as stretches of sandy beach. The Gulf of Mexico is an excellent example of a passive margin. The continental shelf is quite wide at most points along the coast, most notably at the Florida and Yucatán Peninsulas. The shelf
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