The ANTILLES, Azores, and ANTIGUA are all groups of islands located in the West Indies. The ANTILLES is an archipelago of over 7, 000 islands located in the Caribbean Sea, while the Azores is an archipelago of nine volcanic islands located in the North Atlantic Ocean. ANTIGUA is a single island located in the Caribbean Sea. All three of these island groups are part of the West Indies, a region that includes the Caribbean Sea, Gulf of Mexico, and the Atlantic Ocean.