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The Similan Islands (Thai: หมู่เกาะสิมิลัน, Thai pronunciation: [mùː kɔ̀ʔ si.mi.lan], Malay: Pulau Sembilan سمبيلن ڤولاو) is a group of islands in the Andaman Sea off the coast of, and part of, Phang Nga Province, southern Thailand. It is a national park which was established in 1982.
Similan Islands National Park was established after a one-year exploration by the forestry department. The park is an archipelago consisting of nine islands named Ko Bon, Ko Bayu, Ko Similan, Ko Payu, Ko Miang (two adjoining islands), Ko Payan, Ko Payang, and Ko Huyong. Recently, the park was expanded to include two remote islands named Ko Bon and Ko Tachai. The Similans are situated 70 kilometres from Phang Nga town. "Similan" is a Yawi word which means "nine".
The islands are at
Ko Similan is the largest island. There are a total of 9 islands. The sea in the area has an average depth of 60 feet. Underwater it is full of rock formations and coral reefs in several shapes and forms, resembling such things as deer, leaves, brains, and mushrooms.
Above the water are found many diverse species such as the Nicobar pigeon, mangrove monitor lizards and more.
Ko Huyong has the longest and widest beach in the park. However, the park prohibits any tourists from landing on the island as the beach is a place where turtles come to lay their eggs.
The Similan National Park is famous for its dive sites. It has typically two different kinds of diving. East side diving consists of gently sloping coral reefs with sandy patches with the occasional boulder in-between. The west side is known for its huge underwater granite boulders with numerous swim-throughs. Maybe the most famous east side dive site is East of Eden, off island number 7. Elephant Head Rock is arguably the most famous west side dive site with a maze of swim-throughs and the reputation for spin-cycle like currents running in every direction.
Elephant Head Rock was named by Horst Hinrichs from Germany in the mid-1970s, founder of one of the oldest dive shops in Phuket, Santana Diving.
Other popular dive sites include North Point, Deep Six, Boulder City and the awesome pinnacles off Ko Bon and Ko Tachai.
The most important of all dive sites in the Similans, in reality part of Surin National Park, is Richelieu Rock, famous for its incomparable variety and abundance of marine life. Whale shark sightings are not uncommon here. However, since 1999, its once most beautiful dive site, Fantasy Reef, has been closed from all diving activities after its condition had significantly deteriorated. Park chiefs officially blame diving for the deterioration, while dive operators in the area claim that fishing boats, with or without permission, enter the national park during low season, when no dive operators are allowed in the national park. The national park also claims that the dive site suffered significant damage from the tsunami in 2004, and continues to keep the reef closed. Since only national park staff are allowed to dive Fantasy Reef, it has been impossible to confirm that statement.
Islands 1, 2, and 3 are closed for public due for turtle hatching protection program and reef conservation efforts. Island number 3 belongs to HM the Thai Princess. Fishing is banned in Similan and Surin National Park. However, fishing boats are constantly seen in and around the park. When diving, one can often find nets stuck to reefs and illegal fishing traps. Park rangers are posted on several islands, but seem little interested in anything beyond collecting national park fees, which must be paid in cash. In mid-November 2007 the park increased the Surin National Park fee from 400 baht to 600 baht per person with no prior announcement and posted a patrol boat at Richelieu Rock to collect the fees.
In recent years many illegal fishing traps have been found outside the most common dive sites. They have contained among others giant trevallies, batfish, barracuda, golden pilot jacks, and giant triggerfish. Fishing traps seem to be overly abundant around Ko Bon and Ko Ta Chai.
The area has deteriorated to the point that the most famous dive sites are mostly broken and dead coral with few reef fish.
Access to the Similan Islands is easiest from Khao Lak in Phang Nga Province. The mainland office is in Tablamu. Boats depart daily from November-May. The trip takes three hours each way on slow boats or 70 minutes via speedboat.
During the months of November-May live-aboard boats head to the Similan Islands. These dive boats depart and return from Khao Lak, Ko Lanta, Phuket, and Ranong and stay for several days at Similan National Marine Park.
According to the official website, the park is closed in the monsoon (from 16 May-31 October) yearly. These dates are subject to change.