Sipadan (Malay: Pulau Sipadan) is an island located in the Celebes Sea off the east coast of Sabah, Malaysia, formerly belonging to Indonesia. It is the only oceanic island in Malaysia, rising 600 metres (2,000 ft) from the seabed. It was formed by living corals growing on top of an extinct volcanic cone that took thousands of years to develop. Sipadan is in the heart of the Indo-Pacific basin, the centre of one of the richest marine habitats in the world. More than 400 species of fish and hundreds of coral species have been classified in this ecosystem. The area is one of top diving destinations in the world.