- Koh Wao is a rocky island in the north of Ang Thong with a sheltered bay where hard corals lie just a few meters below the surface.
- On the daily speedboat tour (฿1890 per adult) the reef is the first stop, at about 10:00, one hour after the boat leaves Koh Samui.
- The VIP speedboat (฿3890, park fee included) and the private Pearl charter also snorkel at Koh Wao; the big boat does not.
- Masks, snorkels and life jackets are handed out on the boat, and the reef is shallow enough for beginners.
- The water is clearest from January to September; the park is usually closed from 1 November to 15 December.
The engines drop to a murmur, the speedboat swings into a small bay and the guide starts handing out masks. It is about an hour since the boat left the pier, the cliffs are suddenly close, and the water under the hull is clear enough to see dark patches of coral. This is the Koh Wao Ang Thong snorkeling stop, and for most people on a speedboat day to Ang Thong it is the very first time they get wet.
This guide is about that stop: what the reef is really like, who will love it, who will be happier staying on deck, and which tours from Koh Samui actually stop there.
Where is Koh Wao in Ang Thong?
Koh Wao is one of the small rocky islands in the north of Mu Ko Ang Thong National Marine Park, about 28 km west of Koh Samui. It has no beach worth landing on and nobody lives there: what matters is the water around it.
The rocky islands in the north of the park have shallow reefs and small grottoes full of fish, and they are the best snorkeling spots in Ang Thong. At Koh Wao there is a sheltered bay with hard corals just a few meters below the surface, which is exactly why the boats like it as a first stop: it is calm, close and easy.
You will not walk anywhere here. The boat stops off the reef, you climb down the ladder at the back and you snorkel straight from the boat, then climb back in when the guide calls everyone.
Why do most speedboat days start at Koh Wao?
Mostly because the reef is at its best early in the day, when the sea is often calmer and the sun is not yet high. On the daily speedboat tour the boat leaves the pier at 09:00 and the snorkeling stop is scheduled for about 10:00, with Mae Ko and the Emerald Lake following at 11:00.
There is also a practical reason. Snorkeling first means you are wet and cooled down before the stairway to the Emerald Lake, which is short but steep and hot work in the late morning. I like this order a lot: a swim, then a climb, then lunch.
The private Pearl charter follows the same logic. Its usual route starts with snorkeling at Koh Wao at about 10:30, then the Emerald Lake, Wua Ta Lap, lunch on Koh Phaluai and the empty sand of Song Pee Nong.
The VIP speedboat is the exception: it starts at the Emerald Lake at about 09:15, then Wua Ta Lap, and only then the reef at Koh Wao. So on the VIP day the reef comes after two climbs, which some people actually prefer because it cools them down.
Koh Wao Ang Thong reef: what is the water like?
On a calm day it is warm, shallow and sheltered, with coral close enough to see clearly from the surface. You do not need to dive down to enjoy it: floating face down and looking is the whole point.
What you will usually see:
- Hard corals in the bay, in browns, creams and greens rather than the bright colours of aquarium photos.
- Parrotfish, which you often hear before you see them: they scrape algae off the coral with their beak-like teeth.
- Sea urchins with long black spines, tucked into the rocks. Look, do not touch, and do not put your feet down near them.
- Rays resting on the sand at the edge of the reef, if you are lucky and quiet.
- Turtles: green turtles and the rare hawksbill turtle live in the coral gardens of the park, but a sighting is a bonus, never a promise.
Visibility changes a lot. The water is clearest from January to September, when the sea is usually calm. After rain or a windy night it can turn cloudy, and on those days the reef looks greener and softer. That is nature, not a bad stop.
If you want the full picture of what lives on the reefs of the park, I wrote a separate piece on what you will really see snorkeling in Ang Thong. Here I will stay with the stop itself.
Is Koh Wao good for beginners and non-swimmers?
Yes, it is one of the easier snorkeling spots you will find on a day trip. The reef is shallow, the bay is sheltered and every guest gets a life jacket along with the mask and snorkel.
On the speedboat tour the guide stays in the water with the group, which makes a real difference for nervous swimmers. With a life jacket you float on the surface whatever your swimming level, and you can stay close to the ladder if that feels better.
A few honest notes from many mornings out there:
- First-time snorkelers often struggle with the mask for the first five minutes. Breathe slowly through the mouth, keep your face relaxed and it settles.
- Fins are not on the list of what is included, so you swim with your own legs. In a sheltered bay that is fine.
- If the speedboat crossing made you queasy, getting into the water usually helps more than sitting on a rocking boat.
- If you really do not want to swim, you can stay on board. Nobody will push you, and the view of the cliffs from the deck is good.
Children are welcome on the speedboat day: the child price of ฿1490 applies to ages 3 to 12 and up to 130 cm. Whether a small child enjoys the reef depends on the child. Some love floating in a life jacket holding a parent's hand, others refuse the mask entirely. Both are normal.
Which Ang Thong tours stop at Koh Wao?
The speedboat, the VIP speedboat and the private charter snorkel at Koh Wao. The big boat and the Red Baron do not list it: the big boat offers snorkeling off the beach at Wua Ta Lap, and the Red Baron snorkels in a sheltered bay in the afternoon.
| Tour | Koh Wao? | When on the day | Days | Price |
|---|---|---|---|---|
| Speedboat | Yes | First stop, about 10:00 | Daily | ฿1890 per adult, park fee extra |
| VIP speedboat | Yes | Third stop, after the Emerald Lake and Wua Ta Lap | Tue, Thu, Sat | ฿3890 per adult, park fee included |
| Private Pearl charter | Yes, on the usual route | Usually first, about 10:30 | Any day | ฿39,000 per boat for up to 6 guests |
| Big boat | No | Snorkeling off the beach at Wua Ta Lap | Daily | From ฿1100 per adult, park fee extra |
| Red Baron | No | Snorkeling in a sheltered bay, about 14:00 | Wed, Sat | ฿3700 per adult, park fee included |
My honest opinion: if the reef is one of the main reasons you are going, do not pick the big boat. It is a lovely, smooth, budget day, but its snorkeling is a swim off the headquarters beach, not a reef stop like Koh Wao.
The daily speedboat tour is where most people meet Koh Wao, and for good reason: it is the first thing on the program, the guide is in the water with you and the price is the lowest of the three tours that stop there. Just remember the national park fee is not included: ฿300 per adult and ฿150 per child, paid in cash at the park.
The VIP speedboat is the better pick if a crowded reef would spoil it for you. With no more than 16 guests on board, you are sharing the water with a small group, not a full three-engine boat.
For most people the choice comes down to two group tours: the speedboat if you want the reef first thing on any day of the week, the VIP if you want a smaller group and everything already paid.
Can you spend longer at Koh Wao?
On a group tour, no: the reef has its slot in the schedule and the boat moves on to Mae Ko when the guide calls everyone back. On a private boat, yes, and this is one of the few things that really justifies the price.
The private speedboat charter on the Pearl costs ฿39,000 for the boat with up to 6 guests, plus ฿2000 for each extra guest, up to 15. The route is agreed with you, so keen snorkelers can stay longer on the reef, add a second snorkeling session or skip a stop they do not care about. Lunch, kayaking and the park fee are not in the boat price.
I would not book a private boat only for more snorkeling. People choose it for privacy and freedom: no strangers, no fixed timetable, nobody to wait for. If that is what you want anyway, the extra reef time comes free with it.
The captain still has the final word. The route can change with the tide and the weather, and on a windy day the captain may choose a calmer spot.
How to behave on the reef (and protect yourself)
The two rules that matter most: do not stand on the coral and do not feed the fish. The reefs of the park recover slowly, and a single careless step can break years of growth.
Standing on coral also hurts you. Coral cuts sting and heal slowly in the tropics, and the urchins sit exactly where tired snorkelers try to rest their feet. If you need a break, float on your back in the life jacket or swim back to the ladder.
- Use sunscreen well before you get in, so it has time to soak in, and wear a T-shirt or rash vest in the water. Your back burns fast when you float face down.
- Keep your hands to yourself. Nothing on the reef needs to be touched to be enjoyed.
- If you see a turtle, stay back and let it swim away on its own terms.
- An underwater camera is not included on the speedboat tour. A waterproof phone pouch works for a few photos near the surface.
For what to pack and what to wear in the water, the article on what to wear on an Ang Thong tour covers it properly.
When is the best time to snorkel Koh Wao?
January to September is the best period, with calm water and the clearest visibility. October and the second half of December are the rainy season, when the sea can be rough and the water cloudier.
The park is usually closed every year from 1 November to 15 December to let nature recover, and no tours run then. The exact dates are announced by the national park each year, so if you are planning around that window, read what the annual closure means for your trip.
On rough days the captain may change the program or the order of stops, and snorkeling is often the first thing to be moved or shortened when the sea is up. Kayaking and snorkeling are part of the day, not guaranteed extras, so it is worth keeping expectations relaxed in the shoulder months.
A quick plan for the reef stop
Put your swimwear on at the hotel: pickup on the speedboat day is between 07:40 and 08:20, and changing at the hotel is far easier than on a moving speedboat.
- Before the boat leaves, check that your mask fits: press it to your face without the strap and breathe in through the nose. If it stays, it seals.
- Put on the life jacket, even if you swim well.
- Get in, float for a minute and let your breathing settle before you swim off.
- Stay near the group and keep an eye on the guide.
- Climb back in when called, drink water and get ready for the stairway on Mae Ko.
Bring cash for the park fee if you are on the regular speedboat, a towel, a hat for after the swim and a photo of your passport for the insurance. That is all the reef asks of you.
Questions and answers
How deep is the water at Koh Wao?
The bay is shallow, with hard corals just a few meters below the surface. You see the reef clearly while floating at the top, so there is no need to dive down. Depth near the rocks varies, so follow the guide's directions.
Do I need to bring my own snorkel and mask to Ang Thong?
No. Masks, snorkels and life jackets are handed out on the boat on every tour that stops at Koh Wao. If you have your own well-fitting mask, bringing it is a nice comfort, but it is not needed.
Can I see turtles at Koh Wao?
Green turtles and the rare hawksbill turtle live in the coral gardens of the park, so it is possible. Sightings are never guaranteed, though. Parrotfish, sea urchins and rays are far more common.
Does the big boat to Ang Thong stop at Koh Wao?
No. The big boat visits Wua Ta Lap and Mae Ko, and its snorkeling is off the beach at Wua Ta Lap with the mask provided on board. If the reef matters to you, choose the speedboat, the VIP speedboat or a private charter.
Is snorkeling at Koh Wao included in the speedboat tour price?
Yes. The snorkeling stop and the gear are part of the ฿1890 adult price. The national park fee of ฿300 per adult and ฿150 per child is paid separately in cash.
What happens to the snorkeling stop if the sea is rough?
The captain makes the final call. On a rough day the program can change with the tide and the weather, and the snorkeling may be moved, shortened or swapped for a calmer spot.
Can children snorkel at Koh Wao?
Yes, with a life jacket and a parent close by, the sheltered, shallow bay is a good first reef for children. The speedboat child price applies to ages 3 to 12 and up to 130 cm. How long a child enjoys it depends on how they feel about the mask.
Facts checked against our tour pages on 7 November 2026. Prices and days can change: your manager confirms them when you book.
