The total area of the Cocos (Keeling) Islands is approximately 5.4 square miles (14.2 km²), 1.6 miles (2.6 km) of coastline and a highest elevation of 30 ft (9 m). They are thickly covered with coconut palms and other vegetation. Both of the atolls conform to the classic horseshoe formation and are affected by the prevailing winds and ocean. Mudflats are usually found on the lagoon side, while the ocean side contains coral sand beaches.