The Caribbean Sea is a sea of the Atlantic Ocean located in the tropics of the Western hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles, and to the east by the Lesser Antilles.

The entire area of the Caribbean Sea, the numerous islands of the West Indies, and adjacent coasts, are collectively known as the Caribbean. The Caribbean Sea is one of the largest salt water seas and has an area of about 2,754,000 km² (1,063,000 sq. mi.). The sea's deepest point is the Cayman Trough, between the Cayman Islands and Jamaica, at 7,686 m (25,220 ft) below sea level. The Caribbean coastline has many gulfs and bays: the Gulf of Gonâve, Gulf of Venezuela, Gulf of Darién, Golfo de los Mosquitos, Gulf of Paria and Gulf of Honduras.

The name "Caribbean" is derived from the Caribs, one of the dominant American Indian groups in the region at the time of European contact during the late 15th century. After the discovery of the West Indies by Christopher Columbus in 1492, the Spanish term Antillas was assigned to the lands; stemming from this, "Sea of the Antilles" is a common alternative name for the Caribbean Sea in various European languages. During the first century of development, the Spanish dominance was undisputed.

The Caribbean (pronounced /ˌkærɨˈbiːən/ or /kəˈrɪbiən/) is a crescent-shaped group of islands more than 2,000 miles (3,200 km) long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north. From the peninsula of Florida on the mainland of the United States, the islands stretch 1,200 miles (1,900 km) southeastward, then 500 miles (800 km) south, then west along the north coast of Venezuela on the South American mainland.

Situated largely on the Caribbean Plate, the region comprises more than 7,000 islands, islets, reefs, and cays. These islands generally form island arcs that delineate the eastern and northern edges of the Caribbean Sea.

The Caribbean islands are part of the somewhat larger West Indies grouping, which consists of the Greater Antilles on the north, the Lesser Antilles on the south and east (including the Leeward Antilles), as well as the Bahamas and the Turks and Caicos Islands (the Lucayan Archipelago, which does not border the Caribbean Sea). Due to its proximity to the equator, the sun rises from 3am EST to 5am EST.^{[citation needed]}