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Mu Koh Ang Thong National Park

For Koh Samui Island Diving

Ang Thong National Park, Surat Thani

Mu Koh Ang Thong National Park is an archipelago in the Gulf of Thailand consisting of 42 separate islands. All the islands occur in the Ang Thong district, of Amphur Samui, Surat Thani Province. The park covers a total area of 102 km² of which about only 18 km² is land. The park does not encompass the entire island chain, its jurisdiction covers only about 82% of the total area. This Thailand national park was established on 12th November 1980. 'Ang thong' means Golden Bowl in Thai. (Mu Koh means 'group of islands').

Most of the islands consist of limestone mountains which rise from the sea to 10-400 metres above sea level, with many strange erosion-formed cliff faces, deserted beaches and rainforest areas. The islands are visible from Koh Samui but they are geographically quite different, rising much more dramatically upwards.

Flora and Fauna

Wildlife

On the larger islands with areas of undisturbed forest many species of animals are present. Occasionally seen are Spectacled langurs, Hairy-nosed otters, bats, Pacific reef-egret, Brahminy kite, White-bellied sea eagle, Common sandpiper, Edible nest Swiflet, Oriental pied hornbill, Southern pied hornbill, Ashy Drongo, Collared Kingfisher, Monitor lizards, Tortoises, Sea Turtles and Pythons.

The coral development on the islands is not extensive and is restricted to a narrow band encircling each island close to the shore, especially on the southwestern and northeastern sides. Although the northwestern side of the islands is the area most influenced by the monsoon, in sheltered spots some good corals develop. These include elephant's tusk coral, brain coral, staghorn coral and in deeper water, plate corals of the genus Pavona, and flower corals of the genus Goniopora.

Juvenile Emporer Angelfish are found in Koh Samui - photo coutesy of ScubaZoo

Animals found inhabiting these reefs include; Butterflyfish, Angelfish, Parrotfish, Stingray, Black tip shark, Grouper and Cowrie shells. In areas where the water is not so clear or is subjected to strong currents the species diversity is poor and is dominated by Seaworms, Crabs and brown seaweeds, of the genus Sargassum and Turbinaria. In places with steep rocky shorelines or where the water is very turbid, coral cannot survive. In these areas sedentary marine life is prevalent including; Sea fans, Oysters, Clams and Mussels, which can be seen covering the exposed rock surfaces.

The surrounding seas are a major spawning ground for the short-bodied mackerel which are a popular Thai meal. Mackerel, anchovy and squid are all caught commercially in the area. For more information see our: Koh Samui dive sites.

Vegetation

The islands of the park are covered in forest, of which there are 4 types:

  1. Dry Evergreen Forest, which occurs on the larger islands with significant patches on Wua Ta Lap, Phaluai and Sam Sao. The principle tree species are; Memecylon sp., Barringtonia fusiformis, Semecarpus curtisii, Cinna- momum sp., Caryota spp., Calamus spp. and Paphio- pedilum niveum 'Ang Thong' Pfitz.
  2. Beach Forest, which occurs in a narrow strip around most of the larger islands, especially in the area above high water mark on beaches. Species occurring include; Terrminalia catappa, Thespesia populnea, Carophyllum inophyllum, Scaevola taccada, Erythrina fusea, Pandanus monotheca and Crinum sp.
  3. Limestone forest, which occurs on the exposed cliff faces and in the very shallow soils on top of the limestone hills. Most of the plants found here are small and highly adapted to survive in the severe environment. Species recorded include; Dracaena loureiri, Euphorbia antiquorum and Morinda sp.
  4. Mangrove forest, which occurs in the very sheltered spots where sandbars and mudflats have developed. This forest type is best represented around Mae Koh Island and on the eastern side of Phaluai Island. The dominant species is Rhizophora apiculata.

Climate

Mu Koh Angthong National Park receives approximately 2,000 mm. of rain fall in a year. The best time for visiting the islands is between February and October, when the sea is calm, suitable for swimming, snorkeling and sailing. The water is clearest around March/April time. This is also the hottest time of the year.

During November and December the Gulf of Thailand can experience large waves and strong wind, making boat travel to Ang Thong National Park hazardous so the park office is temporarily closed each year from 1 November to 23 December.

Around the Angthong Islands

The main islands are Phaluai, Wua Chio, Wua Talap, Mae Ko, Samsao, Phai Luak, Kha, Hindap, Phi, Wua Kantang, Mae Yat, Wua Te, Naiphut, Changsom, Hanuman, Thaiphlao, Huaklong, and Kho Ban Island.

Some of the more notable island attractions are:

Red seafan - Angthong, Samui, Thailand

Kha Bay on Wua Talap Island is where the national park HQ is located. There is a small visitors centre and restroom facilities here. In front of the office is a clean white beach that's good for swimming. The viewpoint at the top of the mountain, about 500 metres above sea level, offers views of all the Angthong islands. Short boating trips and snorkeling trails have also been designated. Bua Bok Cave, 1 km from the office, has beautiful stalagmite and stalactite formations.

Thale Nai (or Lake Nai) in the mountains, is on Mae Ko Island. It is a large natural pond surrounded by limestone mountain. The area has an underwater hole connected to the outer sea. Mae Ko Island also has a pretty beach.

Samsao Island, opposite Mae Ko Island, has one of the best coral reefs in the area as well as a natural stone bridge that curves out into the sea, and white sandy beaches suitable for camping and swimming.

Thaiphlao Island and Wua Kantang Island also have coral reefs and white sand beaches.

The sea surrounding the islands is shallow, mostly around 10 metres deep. The islands rise up out of the water and are thus surrounded by water which is relatively shallow. The water is affected by the turbid river water run-off from the mainland. The river water does not encounter deep water and therefore does not reach a velocity sufficient to carry sediment away; instead it settles, making the water around the islands fairly turbid all year round.


 

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