Oct 2, 2013 - Caribbean beaches, arguably the best beaches. The Caribbean is a region that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Sea and the North Atlantic Ocean), and the surrounding coasts. The region is southeast of the Gulf of Mexico and the North American mainland, east ofCentral America, and north of South America. Situated largely on the Caribbean Plate, the region comprises more than 700 islands, islets, reefs, and cays. (See the list.) These islands generally form island arcs that delineate the eastern and northern edges of the Caribbean Sea. The Caribbean islands, consisting of the Greater Antilles on the north and the Lesser Antilles on the south and east (including the Leeward Antilles), are part of the somewhat larger West Indiesgrouping, which also includes the Lucayan Archipelago (comprising the Bahamas and Turks and Caicos Islands) north of the Greater Antilles and Caribbean Sea.