Mantehage Island,the Other Side of Bunaken Island Natisional Park Area.

Mantehage Island,Other sides of Bunaken island Marine nasional park

Bunaken National Park extends over an area of 890.65 km² of which only 3% is terrestrial, including Bunaken Island, as well as the islands of Manado Tua, Mantehage, Nain and Siladen,The waters of Bunaken National Marine Park are up to 1,566 m deep in Manado Bay, with temperatures ranging between 27 to 29 °C. It has a high diversity of - corals, fish, echinoderms or sponges. Notably, 7 of the 8 species of giant clams that occur in the world, occur in Bunaken. It also 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.

Oceanic currents may explain, in part, why Bunaken National Marine Park has such a high level of biodiversity. Northeasternly currents generally sweep through the park but abundant counter currents and gyros related to lunar cycles are believed to be a trap for free swimming larvae. This is particularly true on the south side of the crescent-shaped Bunaken Island, lying in the heart of the park. A snorkeler or diver in the vicinity of Lekuan or Fukui may spot over 33 species of butterfly fish and numerous types of groupers, damsels, wrasses and gobies. The gobies, smallish fish with bulging eyes and modified fins that allow them to attach to hard surfaces, are the most diverse but least known group of fish in the park.

Based on Geology, North Sulawesi is considered to be a 'young' formation, of 5-24 million years of age. The region has undergone explosive volcanism 1.5-5 million years ago, which resulted in the volcanic tuff that characterizes the existing topography. Manado Tua is an inactive volcano formed in a classical cone shape and rising over 600 m above sea level, the highest elevation in the park. Bunaken Island also has volcanic origins with a significant amount of uplifted fossil coral. Nain Island is also a dome-shaped island, 139m in height. Mantehage Island is relatively flat and seems to be sinking into the sea. The island has extensive mangrove forest flats, partially separated by saltwater channels. Siladen is a low-lying coral sand island with no significant topography. Arakan-Wawontulap and Molas-Wori on the mainland of North Sulawesi are relatively flat areas at the base of volcanic hills. The absence of a continental shelf allows the coastal area of the park to drop directly down the continental slope. The sea depth between the islands of the park is 200 to 1,840 metres.(source: northsulawesi-tourism).