The Indian Ocean is the third largest of the world’s oceanic divisions, covering approximately 20% of the water on the Earth’s surface. It is bounded by Asia—including India, after which the ocean is named on the north, on the west by Africa, on the east by Australia, and on the south by the Southern Ocean (or, depending on definition, by Antarctica.) Small islands dot the continental rims. Island nations within the ocean are Madagascar (the world’s fourth largest island), Comoros, Seychelles, Maldives, Mauritius, and Sri Lanka. The archipelago of Indonesia borders the ocean on the east.