The Similans are orientated north to south and with the exception of island number five each has its own name. They are commonly identified however by numbers ascending in northerly direction.
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The name "Similan" is derived from the Malay word sembilan, which means "nine", referring to the number of the islands. The best time to visit the area is between early November and the end of Aprl.
Hin Deang and Phi-Phi Islands
The Phi Phi Islands, Hin Daeng and Hin Muang
Superb diving, and spectacular scenery are combined in one trip in the Phi Phi Islands in the Hat Noppamart Thara National Park.
Awesome 300 metre limestone walls tower over the water into the blue sky. Underwater, these cliffs are covered in soft corals, large fans and teeming fish. The wall dives go down to 25 metres, and if you look in the crevices, you find a treasure trove of marine creatures � a harlequin shrimp here, a sea horse there. This is also a good place to see sharks. The white-tips and black-tips are quite shy, but you may be able to swim right up to a sleeping, harmless (they�re crustacean eaters), leopard shark. No touching, please!
The same erosion that created the cliffs also created caves. For experienced divers, it may be possible to do a cave dive at Koh Haa Yai.
The crowning glory of the trip, of course, are Hin Daeng and Hin Muang, the best dive-sites in the South of Thailand. Daeng means pink, and Muang means purple in Thai, and the names derive from the pinkish-red soft corals that cover both rocks. Here, you can dive spectacular drop-offs that go down to 50m, but the greatest draw are the sharks, whalesharks and other large pelagians that frequent here.