Thailand offers two main playgrounds for liveaboard divers, the Gulf of Thailand and the Andaman Sea. Both give access to incredible dive sites, but they offer very different experiences. Picking between them depends on what kind of diving you enjoy, the time of year, and how remote you’re willing to go. If you’re planning your first liveaboard Thailand trip, here’s how the two regions stack up.
Getting There
Trips in the Gulf often leave from Koh Samui or Koh Tao, while Andaman routes usually start from Khao Lak or Phuket. Both are well-connected, but Andaman ports tend to be easier to reach from mainland airports. Travel time to dive sites is shorter in the Gulf, which makes it ideal for shorter trips or first-timers.
The Dive Sites
The Gulf features places like Sail Rock, Southwest Pinnacle, and Chumphon Pinnacle. These are known for schools of fish, big barracuda, and occasional whale shark sightings. The Andaman Sea includes famous sites like Richelieu Rock, Koh Bon, and the Similan Islands. Here, you get deeper drop-offs, stronger currents, and a wider range of marine life, including manta rays and leopard sharks.
Visibility and Conditions
The Andaman tends to win in terms of visibility, especially during peak season from November to April. You might get 25 to 30 meters on a good day. The Gulf usually offers 10 to 20 meters depending on the weather and time of year. Currents are generally milder in the Gulf, which can be more comfortable for new divers.
Seasonal Differences
Timing matters. The Andaman dive season is best from late October to early May, with calm seas and warm water. The Gulf is more flexible but is at its best from May to September. Planning based on the season can help avoid storms or rough water.
Boat Styles and Trip Length
Andaman liveaboards often offer longer trips, ranging from three to seven nights, and the boats may be larger with more onboard amenities. Gulf trips can be as short as overnight or two-day journeys, sometimes using smaller, more basic vessels. There’s something for every budget and comfort level in both regions.
Underwater Life
Both regions deliver, but in different ways. The Gulf leans toward macro life, with nudibranchs, shrimp, and small reef fish being common. The Andaman is more likely to deliver larger pelagics, big schools, and dramatic underwater topography. If you’re into wide-angle photography, the west coast is probably your better bet.
Which One Is Better?
That depends on what you’re looking for. The Gulf is great for shorter trips, calmer conditions, and more accessible sites. The Andaman offers more dramatic diving, deeper sites, and better visibility. Some divers end up doing both to see the contrast.
If you’re trying to choose your first liveaboard route, it’s less about which one is better and more about which one fits your goals. Both sides of the country offer something special and neither one will disappoint.