Carbonate Sand Dunes, Atlantic Ocean
In this 2002 Terra image, calcium carbonate sand dunes are apparent in the shallow waters of Tarpum Bay, southwest of Eleuthera Island in the Bahamas. The sand making up the dunes comes from the erosion of limestone coral reefs, shaped into dunes by ocean currents. Eleuthera Island is one of the larger “out” islands of the Bahamas. The island itself consists mainly of low, rounded limestone hills, and the highest elevation of the island is about 60 meters. It has a rough, karst topography with caves, sinkholes, and cenotes. The
island is surrounded by coral reefs and pink sand beaches.