Thailand Dive Site - Mu Koh Similan
Mu-Koh-Similan
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Chicken-Hair-Reef--Fantasea

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Location :  About 200 m.(220 yd) off the western coast of koh Similan (Island # 8) ; about twice that distance southwest of Turtle Rock (site 6)

Access : Two mooring buots, running east – west act as securings for dive boats and serve as direct descent points to the site.
Condition : Visibility is generally high, between 15 m (50 ft) and well beyond 25 m (66ft.) There can be quick changes in the currents : weak to moderate currents can suddenly increase in strength, so the tremendous site is suitable for experienced divers only.
Average depth : 18 m. (60ft).
Maximum depth : 40 m.+ (130ft)

Though rivaled by elephant head (Site 10), This is one of the favourite dive sites if not the favourite in the similan group. Descending at the eastern (inner) buoy takes you to a rocky plateau at 15m (50ft).This is a great place for underwater photographers. The plateau resembles a stage on which the abundant fish scuffle for the limelight They are by no means camera-shy! Among the would-be stars are Powder-blue Surgeonfish. Spinyfoot and Masked Unicornfish and Schooling and Pennant Bannerfish, Clashing with the extremely photogenic Moorish idols and juvenile Titan Triggerfish. Tapering down towards the southwest is a sheer-walled gully. The entrance is wide enough to venture into, but it soon becomes too narrow; Inside the gully are impressive gorgonian seafans and radiant soft corals; colourful Sea Trout and graceful lionfish are often present in its deeper portions.A giant moray eel is a residents here 
Stonehenge

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Location :  Directly off the northern point of Koh Miang (Island #4)

Access : There is no mooring buoy.
Condition : Currents are moderate strong. Visibility is Typical of the area, at about 15-25m. (50-83ft).
Average depth : 28m. (93ft).
Maximum depth : 40m. (130ft)

This is a deep dive, its best features being below 25m. (83ft.) The site consists of large towering rocks. The alleyways between these host large seafans and barrel sponges. This is a particularly good site for lobsters, and lionfish and Bearded Scorpionfish are likewise plentifull. Unicorn Surgeonfish and large angelfish are other common residents, while pelagics like tuna, barracuda and travelly are frequent visitors. Leopard Sharks are often found on the sand in the deeper parts of this site. There is also a resident shovel-nose shark here.
Christmas-Point
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Location :  The north western apex of Koh Bangu (Island #9) marked by a small collection of     outcrops some 50m (55yd) from the island’s northern shore.
 Access : This site is buoyed.
Condition :  Excellent Visibility, often exceeding 25m. (83ft) currents run weak to moderate, occasionally strong.
Average depth : 20m. (66ft).
Maximum depth : 34m. (113ft)

The southwestern section features triangular boulders at 22m (73ft); These continuedown to depths greater than 25m (83ft). Where you find leaning boulders, offering mazes of swim throughs. The walls and sides are highlighted by radiant soft corals around there are numerous Parrot fish of all sizes., Small Dog-faced Pufferfish and larger solitary Clown Triggerfish.The overhangs and caves usually sport prides of lionfish traveling below the air pockets as if admiring their own gracefulness, Sharks, Manta’s are also frequent visitors.The eastern section is the shallowest, averaging 15m. (50ft). The reef is basically formed by terraced foliaceous hard corals. Table-and Staghorncorrals provide a safe-haven for a large variety of juvenile reeffishes.
Coral-Gardens-Hobbitland

Location : Following the eastern side of Koh Huyong (Island#1)
Access : There is no mooring buoy.
Condition : Visibility ranges between 15m. and 25m. (50/83ft). Currents can be strong, a great drift-dive.
Average depth : 5m. (16ft).
Maximum depth : 24m. (80ft)

It has the typical formation of an east-facing site in this area There are good examples of branching and table corals on the reef-plateau, Which lies in very shallow water as well. There are many fire corals on the reefs-lope, with anemones hosting various clownfish, butterflyfish and basslets. 

Elephant-Head

Location : The giant rocky outcrop off Koh Similan’s (Island#8) Southern tip. As you approach from 15m. (50ft) to in excess of 25m. (83ft). Currents can be strong, flowingnorth-south. There can be strong surge
Average depth : 24m. (80ft).
Maximum depth :70m. (235ft).

The underwater terrain is breathtaking. The dive takes you around huge boulders, some with frames measuring over 30m (100ft), sitting individually or stacked high to form daring swim throughs comprising arches, caverns, channels and tunnels at all depths. There is plenty of marine life and hard and soft corals, the former residing in the site’s shallower sections, the latter clinging to the undersides of the boulders. It’s also a good spot to see various types of sharus.