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Bunaken is part of the Bunaken National Marine Park, which has some of the highest levels of marine biodiversity in the world. Scuba diving attracts many visitors to the island. Bunaken is located at the north of the island of Sulawesi, Indonesia. It belongs administratively to the municipality of Manado.
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The waters of Bunaken National Marine Park are extremely deep (1566 m in Manado Bay), clear (up to 35-40 m visibility), refreshing in temperature (27 to 29 °C) Pick any of group of interest - corals, fish, echinoderms or sponges - and the number of families, genera or species is bound to be astonishingly high. For example, 7 of the 8 species of giant clams that occur in the world, occur in Bunaken. The park has around 70 genera of corals; compare this to a mere 10 in Hawaii. Although the exact number of fish species is unknown, it may be slightly higher than in the Philippines, where 2,500 species, or nearly 70% of all fish species known to the Indo-western Pacific, are found.