Geography of Indonesia
Indonesia is an archipelagic country extending about from east to west and from north to south. According to a geospatial survey conducted between 2007 and 2010 by National Coordinating Agency for Survey and Mapping (Bakosurtanal), Indonesia has 13,466 islands. While earlier survey conducted in 2002 by National Institute of Aeronautics and Space (LAPAN) stated Indonesia has 18,307 islands. According to the CIA World Factbook, there are 17,508 islands. The discrepancy between the surveys is likely caused by the earlier different survey method including tidal islands, sandy cays and rocky reefs that surface during low tide and submerge during high tide. There are 8,844 named islands according to estimates made by the government of Indonesia, with 922 of those are permanently inhabited. It comprises five main islands: Sumatra, Java, Borneo (known as "Kalimantan" in Indonesia), Sulawesi, and New Guinea; two major island groups (Nusa Tenggara and the Maluku Islands) and sixty smaller island groups. Four of the islands are shared with other countries: Borneo is shared with Malaysia and Brunei; Sebatik, located off the northeastern coast of Kalimantan, shared with Malaysia; Timor is shared with East Timor; and the newly divided provinces of Papua and West Papua share the island of New Guinea with Papua New Guinea.
Tourism in Indonesia
With more than 17,508 islands, Indonesia presents ample diving opportunities. With 20% of the world's coral reefs, over 3,000 different species of fish and 600 coral species, deep water trenches, volcanic sea mounts, World War II wrecks, and an endless variety of macro life, scuba diving in Indonesia is both excellent and inexpensive. Bunaken National Marine Park, at the northern tip of Sulawesi, claims to have seven times more genera of coral than Hawaii, and has more than 70% of all the known fish species of the Indo-Western Pacific. According to Conservation International, marine surveys suggest that the marine life diversity in the Raja Ampat area is the highest recorded on Earth. Moreover, there are over 3,500 species living in Indonesian waters, including sharks, dolphins, manta rays, turtles, morays, cuttlefish, octopus and scorpionfish, compared to 1,500 on the Great Barrier Reef and 600 in the Red Sea. Tulamben Bay in Bali boasts the wreck of the US Army commissioned transport vessel, the . Other popular dive sites on Bali are at Candidasa and Menjangan. Across the Badung Strait from Bali, there are several popular dive sites on Nusa Lembongan and Nusa Penida. Lombok's three Gilis (Gili Air, Gili Meno and Gili Trawangan) are popular as is Bangka. Saronde Island is a very popular spot also in Gorontalo Sulawesi. Some of the most famous diving sites in Indonesia are also the most difficult to reach, with places like Biak off the coast of Papua and the Alor Archipelago among the popular, more remote, destinations for divers.