Little San Salvador Island, also known as Half Moon Cay, is one of about 700 islands that make up the archipelago of The Bahamas. It is located roughly halfway between Eleuthera and Cat Island, administratively in the Cat Island District. It is a private island, owned by Carnival Corporation & plc, which uses it as a port of call for the cruise ships it operates in th…Little San Salvador Island, also known as Half Moon Cay, is one of about 700 islands that make up the archipelago of The Bahamas. It is located roughly halfway between Eleuthera and Cat Island, administratively in the Cat Island District. It is a private island, owned by Carnival Corporation & plc, which uses it as a port of call for the cruise ships it operates in the region. Prior to being owned by Carnival, Little San Salvador was the private island of Norwegian Cruise Line.