The southern coastline is characterized by sandy beaches backed by coastal dunes. The dunes can reach up to in height, and older dunes are vegetated. Behind the coastal dunes are lagoons, including river estuaries, closed saline lagoons, and salt lakes. Some north of the South African frontier is the deep indentation of Maputo Bay (formerly Delagoa Bay). The land then turns outward to Cape Correntes, a little north of which is Inhambane Bay. Bending westward again and passing the Bazaruto Archipelago of several small islands, of which the chief is Bazaruto.