Overview of Thailand's Dive-sites

The Andaman Sea
Extending from Myanmar down past the west coast of Thailand to beyond the Malaysian border, the Andaman Sea forms part of the Indian Ocean. Many of the 155 islands in the Andaman Sea are uninhabited (apart from communities of Chao Ley – ‘sea gypsies’), and are crowned by lush primary vegetation tumbling down to a shoreline punctuated by idyllic sandy beaches.
Most of the diving in this region is organized from the popular holiday island destination of Phuket, with a wide variety of operators offering recreational and technical training, day trips, and liveaboard options. The best time for diving is between October and May.
In general the Andaman Sea has more extensive coral reefs but similar visibility to the Gulf of Thailand, with most of the reefs around the offshore islands occurring on the east sides of the islands, due to the influence of the southwest monsoon; the west coasts tend to have rocky slopes descending to 10-30m in depth.
Towards the northern end of the Thai coastline, a series of granitic outcrops lie in deep, clear water with reefs descending to 25-30m and beyond in depth. These are the Similan and Surin Islands, whose breathtaking underwater scenery and great diversity of marine life have gained them a considerable reputation in the diving community.
Given their proximity to Phuket, it is not surprising that these two island groups are among the country’s most popular destinations for day trips and liveaboard excursions.
Further to the north in Myanmar is the Mergui Archipelago, recently opened to foreigners, offering real wilderness diving over unusual underwater terrain, with the added attraction of shark encounters.
The coastline of Phuket itself offers little for the experienced diver, although there are dive sites that can be (and are) used for training and are also a good option if bad weather prevents boats getting to the better sites.
These offshore sites are mostly to the south, and can be reached by relatively short boat rides of between one and two hours. They are all well worth the journey, but two in particular Shark Point and Anemone Reef stand out as being special in terms of the abundance of marine life.
Further south, the coastline at Krabi offers shallow fringing reefs around impressive limestone formations (ranging in size from underwater pillars to whole islands). Some of the best snorkelling sites in the country are to be found here.
Offshore, the Phi phi islands, with their palm-fringed beaches, have been growing in popularity as a dive base for the last two decades. This is not surprising as the local waters experience great visibility complemented with a rich variety of corals and marine life; shallow fringing and patch reefs are an added attraction for snorkellers.
The most southerly established dive sites in the country are to the south of Koh Lanta. They feature pristine corals and spectacular fringing reefs in potentially excellent visibility. Here are some of the finest dive sites in the country, such as Hin Mamuang, which features the deepest drop-off in Thailand, with depths in excess of 70m, and Hin Daeng, one of the few remaining dive sites where both manta rays and whale sharks are regularly encountered.
Another dive destination in the Andaman Sea that is still in its infancy is Mu Koh Tarutao Marine National Park (just north of the Malaysian border), where dugongs have been seen.
Dive sites
Koh Lipe Koh Lanta Krabi
please click on each map for detailed informations
Phi Phi Islands Phuket Khao Lak
Similan Islands others
The Gulf of Thailand
The Gulf of Thailand coast, at 1,840km well over twice as long as the Andaman Sea coastline, follows a great parabola from the border with Malaysia on the south coast around to Cambodia and the southwest tip of Vietnam. The Gulf itself is a vast, shallow depression – generally less than 60m deep and reaching a maximum of 85m – which, while incredibly productive, does not have continually great visibility.
This is largely due to the turbid waters from river outlets being trapped in the Gulf by an underwater shelf that stretches across the mouth of the Gulf from Malaysia to Vietnam. True reefs do not occur further north than those found in the Ban Krut area in Prachuap Khiri Khan Province, just over 300km south of Bangkok.
There are 112 islands in the offshore waters of the Gulf, many with fringing reefs interspersed with rocks and soft seabed. Visibility around their shorelines tends to be better than the mainland, where inshore waters are affected not only by turbidity but by freshwater runoff and urban/industrial pollution. The offshore reefs have a lower diversity than the reefs of the Andaman Sea, but marine life is still reasonably prolific, with Indo-Pacific species predominating.
Western Gulf
Some of the best dive sites in the Gulf of Thailand are around Koh tao, 80km from the mainland. Sheer wall dives around submerged pinnacles, tunnels and archways carpeted with iridescent soft corals, pelagics (including sharks), and easy snorkelling from the beaches over impressive coral gardens are just some of the highlights of Koh Tao.
Koh Phangan, 47km south of Koh tao, is a Bohemian paradise. The fringing reefs around the island are of limited appeal, but two sites to the north – Sail Rock and Samran Pinnacles – are truly world-class, spectacular wall dives, acting as a magnet for numerous schools of pelagics.
Koh samui, further south, has a well developed tourist infrastructure and some enjoyable dive sites on its fringing reefs. Visibility around Koh Samui is only slightly better than that aroundKoh Phangan, and most people use it as a convenient (and fun) base from which to dive sites to the north of Koh Phangan or around Koh tao.
Further to the south, the clear waters around Koh Losin, located above the Malaysian border, are occasionally dived from liveaboard excursions and are a great place for encountering manta rays, whale sharks and large schools of trevally.
please click on each map for detailed informations
Pattaya Koh Chang National Park
Eastern Gulf
Working eastwards from Bangkok, Pattaya has a well developed dive industry for both recreational and technical divers.Thailand’s easternmost diving and snorkelling area covers the waters around and to the south of Koh Chang, in Trat province. This is an up and coming destination and one well worth visiting.
Aside from a great diversity of dive sites including reefs, walls and pinnacles the associated marine life is as diverse as it is high and includes regular encounters with all sizes of marine life from minute invertebrates up to enormous whale sharks.
please click on each map for detailed informations
Chumpohn Koh Tao Koh Samui
Last Updated (Friday, 25 March 2011 07:54)

















