It's not easy to get to, but is it worth it!Situated largely on the Caribbean Plate, the region comprises more than 7,000 islands, islets, reefs, and cays. These islands, called the West Indies, generally form island arcs that delineate the eastern and northern edges of the Caribbean Sea. These islands are called the West Indies because when Christopher Columbus landed here in 1492 he believed that he had reached the Indies (in Asia).