Rum Cay (formerly known as Mamana and Santa Maria de la Concepción) is an island and district of the Bahamas. It measures 30 square miles in area, it is located at Lat.: N23 42' 30" - Long.: W 74 50' 00". It has many rolling hills that rise to about 120 feet (37 m). The island is believed to have acquired its modern name from a shipwrecked cargo of rum. The main settlement is Port Nelson. Its population was recorded as 53 in the 1990 census.