UncategorizedDiving the Gulf of Thailand from Koh Samui
By the Diving Seasons team, from Koh Samui
When people talk about diving in Thailand, almost everyone thinks of Similan or Phuket. Yet the Gulf of Thailand is a very easy destination to enjoy: warm water, islands close to each other, good infrastructure and one site, Sail Rock, that every diver should have on their list.
This is a guide to what the area offers, seen from Koh Samui.
Why the Gulf is such a good choice
First, comfort. The water sits around 28–30 °C for much of the year, so you dive light and enjoy it more. Second, logistics: Samui, Phangan and Tao are linked by ferries and catamarans, so a dive trip can be put together without internal flights or endless transfers.
Third, variety. There are gentle dives for beginners and pinnacles with more character for divers who already have some hours in the water. You don’t need to be an expert to have a great time, but you won’t feel short-changed if you are.
Sail Rock: the star dive
If you had to choose a single dive in the Gulf, it would be Sail Rock. It’s a pinnacle rising out of the sea between Koh Phangan and Koh Tao, in open water, and that changes everything: being isolated, it attracts a lot of life.
Speed boat and other diving boats frequently are visiting rock
Highlights:
- The Chimney: a vertical crack you ascend through from around 18 m to about 6 m, with light coming in from above. It’s one of those dives that stay in the memory.
- Barracuda and big eyes trevally in dense columns around the rock.
- Big groupers, clown fish and schools of batfish.
- Whale shark: they have been seen in the area, but it’s never guaranteed. It’s best to go with excitement, not expectations.
An Advanced Open Water level or equivalent experience is recommended. There can be current and the depth goes beyond 30 m. It’s wise to choose a good dive center, listen carefully to the briefing and respect your times and depths.
Whale swimming in the blue. waters.
Koh Tao: where diving is in the air
Koh Tao is small, but the diving atmosphere is huge. It’s one of the places in the world where the most people get certified every year, so there are centers for every level, from Open Water to Divemaster and instructor.
Sites worth putting on the list:
- Chumphon Pinnacle: a granite big rock, cover of anemones and with barracuda and big fish schooling.
- Southwest Pinnacle: similar Chumpon one of the most complete dives on the island.
- HTMS Sattakut: a wreck sunk as an artificial reef, great if you enjoy underwater structures.
- Twins and Shark Island: more relaxed dives, beautiful coral interesting macro life, perfect for taking your time and for underwater photography.
Mango bay. Koh tao
Koh Phangan: more than parties
It’s known for its full moon parties, but the island also has quiet beaches, yoga and wellness retreats. For divers, it’s also a very practical gateway to Sail Rock and an excellent base for alternating dive days with rest days.
Koh Samui: the comfortable base
Samui is the largest and best-connected island: an airport, accommodation for every budget, great food and plenty of choice. From the island, trips run to Koh Tao and Sail Rock, and it’s also possible to visit Ang Thong National Marine Park, an archipelago of limestone islands that pairs well with snorkeling or kayaking.
For those traveling with someone who doesn’t dive, Samui is the easiest option: the non-diver gets beaches, spas and excursions, and the diver gets their dives.
Giant grouper in sail rock
When to go
The best time to dive in the Gulf is usually from January to September, with better visibility and generally calmer seas. Toward the end of the year; mid October till mid december, the Gulf monsoon brings more rain and swell, and some trips can be canceled. Conditions vary from year to year.
How to plan the trip
With 7 to 10 days, a good route is to start in Samui to settle in, move on to Phangan or Tao, That leaves time to dive the main sites, do a trip to Sail Rock and still have days left to rest and explore the islands.
Ready to go?
Ready to go?
The Gulf of Thailand is a hard combination to beat: good diving, warm water, simple logistics and Thai tropical island atmosphere. Anyone who wants help designing a trip through Samui, Phangan and Tao can count on Diving Seasons, which takes care of organizing it.
