Surin Islands

The Andaman’s quieter, more pristine national park

The Surin Islands sit about 60 km northwest of Khao Lak and about 100 km from Phuket — far enough that the visitor numbers are a fraction of what the Similan Islands see. There are five islands in the group, with Koh Surin Nua (North Surin) being the largest and the site of the main park headquarters. The islands are part of the Mu Ko Surin National Park, and they share the same annual closure schedule as the Similans: closed from around May 15 through October 31.

The dive sites here are primarily hard coral, and the coverage is exceptional compared to many more frequently visited locations in Thailand. The most famous site — Richelieu Rock, a submerged pinnacle about 20 minutes by speedboat from the main islands — is consistently listed among the world’s top ten dive sites. Whale sharks appear at Richelieu Rock with higher frequency than anywhere else on the Andaman coast.

The Moken sea nomads have lived on and around the Surin Islands for centuries. A small community of Moken people maintains a village on the south coast of North Surin Island, and some organized tours include a culturally respectful stop there. The Moken are among the last semi-nomadic maritime peoples in Southeast Asia; the visit is genuinely educational if handled thoughtfully by the operator.

Where	~60 km northwest of Khao Lak, Andaman Sea
Cost	National park fee 500 THB; day trips 3,000–5,000 THB
Time needed	1 day from Khao Lak, or 2–3 days liveaboard
Getting there	Speedboat from Tab Lamu Pier, Khao Lak, 2–2.5 hrs
Best time	November–April only; whale sharks January–April

Richelieu Rock: the whale shark site

Richelieu Rock is a single submerged granite pinnacle rising from around 35 meters depth to just below the surface. It has no visible dry land — you can dive it but not stand on it. The nutrient-rich upwellings around the rock attract manta rays year-round and whale sharks with particular consistency between January and April.

Whale shark encounters here are more probable than at the Similans, though “more probable” still means a sighting on perhaps 1 in 3–4 trips during peak months rather than every trip. Jacques Cousteau reportedly called Richelieu Rock “the most beautiful dive site in the world.” The hard coral and gorgonian fans at depth substantiate the claim; visibility regularly exceeds 20 meters in the dry season.

The site is a technical dive in moderate to strong current. Advanced Open Water certification is the minimum; experience with current is preferable. Some operators offer guided dives for newly certified divers at the shallower sections of the rock (10–15 meters), but this is not a site for first-time divers.

Surin Islands snorkeling and Moken village tour from Khao Lak

Day trips vs. liveaboards

Day trips to the Surin Islands from Khao Lak are possible but demanding. The boat journey is 2–2.5 hours each way, which leaves around 4–5 hours at the islands. This is enough for 2 dives or a morning of snorkeling plus the Moken village visit, but not much more.

Liveaboard dive boats typically combine the Similans and the Surins in multi-day itineraries (4–7 nights), which is the recommended format if serious diving is your goal. Richelieu Rock is a 1.5–2 hour journey from the main Similan dive sites and is often visited on the final morning before a liveaboard returns to port. Prices for liveaboards including the Surins run 15,000–35,000 THB (~€398–928) depending on boat grade and duration.

Day trip pricing from Khao Lak: approximately 3,000–5,000 THB (~€80–132) per person for a snorkeling day trip with lunch and park fees. Dive day trips add 1,500–2,000 THB for equipment and dive guide services.

Surin Islands day trip from Phuket or Khao Lak

Snorkeling for non-divers

The snorkeling around the main Surin Islands is less technically impressive than Richelieu Rock but more accessible. The house reefs near the park headquarters pier on North Surin have good coral coverage down to 6–8 meters and reasonable fish diversity. Seasonal upwellings mean the water can be cooler than the Similans (sometimes 25–26°C versus 29°C near Phuket) — not cold by any standard, but worth knowing if you’re sensitive to water temperature.

Non-divers find the Surins more enjoyable when combined with the Moken village visit and a beach stop on one of the quieter islands. The total experience is more culturally textured than the Similans, which are almost exclusively marine-focused.

For comparison, best snorkeling in Phuket guide covers all the main sites including both Surin and Similan contexts.

The Moken village

The Moken community at Surin consists of around 200–300 people. Tourism visits are handled through a formal arrangement with the national park, and some operators bring groups for 30–60 minute walkthroughs. The most respectful visits are small-group, led by bilingual guides who can contextualize what you’re seeing without reducing it to a spectacle.

Photography should be approached with caution and consent — asking before photographing individuals is basic courtesy. Some Moken residents sell traditional handicrafts, particularly woven items and model boats.

The Moken’s traditional nomadic lifestyle was severely disrupted by the 2004 Indian Ocean tsunami, which the Surin Islands community survived with remarkably low casualties because of traditional knowledge about sea behavior before tsunamis. This history is part of what makes the village visit genuinely meaningful rather than merely exotic.

Getting there from Phuket

The Surin Islands are further from Phuket than the Similans — roughly 100 km — and Khao Lak is the standard base. Most organized trips depart Tab Lamu Pier in Khao Lak. Staying in Khao Lak the night before an early-morning departure is strongly recommended if you’re coming from Phuket.

Private transfers from Phuket airport to Khao Lak cost approximately 1,200–1,800 THB (~€32–48) and take 2–2.5 hours. Public minibuses exist but are infrequent and require a stop in Phang Nga town. See Khao Lak destination guide and Phuket transport guide for logistics.

What to pack for the Surin Islands

Bring more than you think you’ll need, since North Surin’s park headquarters has only a basic canteen and a small shop with limited stock. Reef-safe sunscreen matters here specifically, given the exceptional hard coral coverage the park exists to protect. A dry bag protects electronics on the speedboat crossing, which at 2–2.5 hours each way is long enough to get genuinely wet in rough conditions. Divers heading to Richelieu Rock should bring proof of Advanced Open Water certification (or equivalent logged dives) since operators check before allowing divers on the deeper sections. Cash is essential — there are no ATMs on North Surin or at Tab Lamu Pier once you’ve left Khao Lak town.

Whale shark odds: Surin vs. other Andaman sites

Site	Approx. sighting frequency	Best months
Richelieu Rock (Surin)	~1 in 3–4 trips in peak season	January–April
Similan Islands (north sites)	~1 in 6–8 trips	January–April
Racha Island channel	Occasional, lower frequency	November–March

No site guarantees a sighting — whale sharks are wild, migratory animals — but Richelieu Rock has the most consistently documented encounter rate on the Andaman coast, which is the main reason serious divers add the Surins to a Similans-based liveaboard itinerary.

Comparing Surin vs. Similan Islands

Both parks are national parks, share the same closure schedule, and depart from Khao Lak. The key differences:

• Similan: More dive sites, easier day trips, better beginner diving, larger archipelago, more famous name.
• Surin: Higher whale shark probability (Richelieu Rock), more unique cultural element (Moken village), lower visitor numbers, slightly longer journey.

For divers, the Similans are the default choice; Richelieu Rock makes the Surins worth adding if you have extra time. For snorkelers, the Similans have better facilities and a shorter travel day.

Frequently asked questions about Surin Islands

Are the Surin Islands open year-round?

No. Like the Similan Islands, Mu Ko Surin National Park closes every year from approximately mid-May through late October. No tourist boats or dive operators run to the islands during this period. Plan visits between November and April.

How far are the Surin Islands from Phuket?

The Surin Islands are about 100 km northwest of Phuket. The most practical access is from Khao Lak, 90 km north of Phuket. The speedboat journey from Tab Lamu Pier takes 2–2.5 hours. Direct day trips from Phuket exist but are very long days — better to overnight in Khao Lak first.

What is Richelieu Rock?

Richelieu Rock is a submerged granite pinnacle about 20 minutes by boat northwest of the Surin Islands. It’s one of Southeast Asia’s most famous dive sites, known for whale shark encounters (primarily January–April) and exceptional hard coral and gorgonian coverage. Visibility often exceeds 20 meters. The site involves moderate to strong currents; Advanced Open Water certification is recommended.

Can I do a whale shark dive without advanced certification?

Some operators will guide Open Water certified divers on the shallower sections of Richelieu Rock, but the main site involves currents that require experience. Most reputable operators recommend Advanced Open Water minimum. If you’re planning specifically for whale sharks, completing an Advanced course at Phi Phi Islands or Phuket before the Surin trip is worth the investment.

Is camping available at the Surin Islands?

The national park offers bungalows and camping facilities on North Surin Island. Unlike the Similans, the Surins have basic park bungalows with beds (around 1,200–1,500 THB per night) in addition to tent camping areas. Booking through the national park (Mu Ko Surin National Park) directly is required. Availability is limited in peak season.

How do the Surin Islands compare to Koh Lipe?

Koh Lipe is in the Tarutao National Marine Park near the Malaysian border — geographically very different from the Surins. Koh Lipe has much more tourism infrastructure (resorts, restaurants, a party scene) while the Surins have almost none. Diving around Koh Lipe is different marine territory. If you’re deciding between them purely on remoteness and dive quality, the Surins win clearly.

What’s the best time of year to see whale sharks at Surin?

January through April, with the peak typically in February and March. Whale sharks follow prey fish aggregations, and Richelieu Rock’s upwelling conditions are strongest in late dry season. No encounter is guaranteed, but your best statistical odds are on early-morning dives at Richelieu Rock in February.

Should I choose the Similans or the Surins if I can only do one?

For most travellers, the Similans are the more practical choice — more dive sites, easier logistics, and better snorkeling facilities for non-divers. Choose the Surins instead if whale sharks or the Moken village visit are a specific priority, or if you’re already an experienced diver looking for lower visitor numbers and more technical sites like Richelieu Rock.

Do I need to dive to visit the Surin Islands?

No — snorkeling and the Moken village visit are both accessible to non-divers, and many day trips are structured around exactly that combination. That said, the Surins’ reputation rests primarily on Richelieu Rock, which is a dive site; non-divers get a good but less headline-grabbing experience than divers do.