Ko Ta Chai

Ko Bon

Ko Ba Ngu (Ko Kao)

Ko Payu (Ko Chet)

Ko Miang (Ko Si)

Ko Similan (Ko Paet)

Ko Hok

Ko Ha

       The Mu Ko Similan National Park consists of steep granite hills, sandy beaches, and various shapes of rocks. The island's coast has a dented and irregular appearance formed by the sea, which erodes the island through waves which predominantly move in a north-south direction. The water surface is part of the Andaman Sea, which is in the eastern Indian ocean. The continental shelf borders the west coast of Phang-Nga Province and Burma, parallel to the Nicobar Islands, which are on the continental shelf of India. There is no muddy soil on the beach or dunes; therefore, the beach is clean and has fine sand particles. The top of the mountain is steep, with a peak at 244 meters above sea level. Some of the islands are flat and surrounded by dunes and coral reefs.

       Summer runs from mid-February to May and the rainy season runs from mid-May to October.

       - The average temperature throughout the year is 27 degrees Celsius.

       - The relative humidity is high, with an average throughout the year of about 83%.

       - The average annual rainfall is 3,560 mm.

       - The amount of average annual evaporation is 1,708 mm.

     - During the rainy season, the southwest monsoon may cause heavy rain and strong waves. Traveling to the Mu Ko Similan National Park during this period is not safe for visitors. The scheduled seasons are as follows:

      - Close tourist season from May 16 to October 14 of every year.

      - Open tourist season from  October 15 to  May 15 of every year.

     The beach forest is a sparse forest with scattered plants that are less than 15 meters tall and include Tropical Almond, Fish Poison Tree, and Alexandrian Laurel. Small perennial plants and large shrubs with a height of less than 10 meters are found, such as Xylocarpus rumphii (Kostel.) Mabberley, Heritiera littoralis Aiton, and Coast Cotton Tree. There are also small shrubs such as Capparis micracantha DC, Breynia reclinata (Roxb.) Hook.f, and Seashore Screwpine. Ground cover plants found are beans, Phaseolus semierectus., Para Cress, and

grasses such as Whip Grass, Imperata cylindrica (L.) Raeusch, and Bamboo. The epiphyte plants are Bird's-Nest Ferns and Hoya carnosa.

    2. Grove wood is a group of shrubs that grow on thin soil that is less than 30 centimetre deep. Plants found are not very dense, and include Torch Thistle  and Dracaena loureiri Gagnep. Commonly found small shrubs are Memecylon garcinioides Blume and Cleistanthus helferi Hook.f.

    3. tropical rain forest has large perennial plants that are 20 meters tallor more, such as Dipterocarpus costatus, Siamese Rosewood, and Shorea curtisii Dyer ex King. Trees in the understory with a height of 15–20 meters include Palaguium obovatum, Syzygium grande (Wight) Walp., Wrightia Tree, and medium-sized perennial plants of 10–15 meters height are Chaulmoogra, Semecarpus curtisii King, and Diospyros diepenhorstii. Lower ground plants found include wild bamboos, rattan, palms, Ivy, and vines such as Ceriman and Bauhinia saccocalyx. In addition, orchids and parasite plants are found on large branches.

In Mu Ko Similan National Park, rare plants like Manilkara littoralis (Kurz) Dubard and Heliotropium arboreum (Blanco) Mabb. only on the large islands. The edible plants found include Manilkara littoralis (Kurz) Dubard, Bouea oppositifolia (Roxb.) Meisn., Lepisanthes rubiginosa (Roxb.) Leenh., Djenkol Bean, Melientha suavis Pierre, and Capparis micracantha DC.

Wild animals discovered in the survey include:

         Mammals: Most of the mammals found were small, such as the Island Flying-Fox, the Black-Bearded Tomb Bat, and the Black Giant Squirrel. The largest mammal found was the Bottlenose Dolphin. Repyiles include sea turtles, with the most important species being the Leatherback Sea Turtle and the Hawksbill Sea Turtle. Other reptiles include Bengal Monitors and Squirrels non-venomous snakes such as Reticulated Pythons.

Birds that are commonly found in National Park areas include non-migratory birds, such as Brahminy Kite and White-Breasted Waterhen. Migratory winter visitors to Thailand include the Pin-Tailed Snipe and the Grey Wagtail. The endemic birds that sometimes migrate include the Barn Swallow, Cattle Egret, Watercock, and Roseate Tern.

      The critical fish species found around the islands include sharks, Blue Marlin, stingrays, flying fish, and Puffer Fish. Coral reef fish include Butterfly Fish, Angel Fish, and many other economically valuable fish.

The most important species of invertebrates are corals and jellyfish. The corals surrounding the Mu Ko Similan are mostly deep-water corals such as Leaf Corals, Bottlebrush Corals, and porous corals, including coral colonies, sponges, and soft corals.