The Greater Antilles is a grouping of the larger islands in the Caribbean Sea, including Cuba, Hispaniola, Puerto Rico, Jamaica, and the Cayman Islands. Six island states share the region of the Greater Antilles in total, with Haiti and the Dominican Republic sharing the island of Hispaniola.

While most of the Greater Antilles consists of independent countries, the island of Puerto Rico is an unincorporated territory of the United States, while the Cayman Islands are a British Overseas Territory. The largest island by area and population is Cuba, which extends to the western end of the island group. Puerto Rico lies on the eastern end, and the island of Hispaniola is located in the middle. Jamaica lies to the south of Cuba, while the Cayman Islands are located to the west. The state of Florida contains the closest point to the Greater Antilles within the U.S mainland, while the Florida Keys, although not within the Greater Antilles, is an island group north of Cuba.

Cuba, officially the Republic of Cuba, is a country comprising the island of Cuba as well as Isla de la Juventud and several minor archipelagos. Cuba is located in the northern Caribbean where the Caribbean Sea, Gulf of Mexico and Atlantic Ocean meet.

More Info: en.wikipedia.org