Snorkelling on Koh Tao Best Bays, Boat Trips & Reef Rules

Snorkeling Koh Tao is easy to start and hard to get bored of. The island is small, the water is warm all year, and you can wade into a coral bay with turtles or baby reef sharks on a single afternoon, no boat needed. Most of the best shallow reef sits on the east and south coasts, so a motorbike or a taxi will do more for your snorkelling than any tour.

This guide covers eleven spots, shore and boat, with what you can expect to see, the best time to go and who each place suits. You will also find how round-the-island boat trips work, where to rent gear, how to stay safe around boats and currents, and the simple habits that keep the coral alive.

Best snorkelling spots on Koh Tao at a glance

Shore spots are free or cost a small access fee at the resort that owns the beach. Boat spots are covered by the usual tours, or by a longtail you hire yourself. Conditions change with wind and rain, so ask your guesthouse or dive centre what the sea is doing today. The table gives the short version and the notes below add detail.

Shore snorkelling spots

Shark Bay (Thian Og) is the island's best-known shallow wildlife spot. Walk in from the beach and you may meet green turtles grazing on seagrass and small blacktip reef sharks patrolling the sand. The reef itself took damage in recent years, so come for the animals, not the coral. Go early in the morning or after about 4 pm, before and after the tour boats. Some access points ask for a small fee. See the Shark Bay beach guide and the nearby Shark Island dive site for the bigger picture.

Aow Leuk is a calm white-sand bay on the south-east coast. Juvenile blacktip reef sharks cruise the shallows, there are boulders and reef on both sides, and the water stays flat when the west coast is windy. It is the best place for a first snorkel and a good place to practise before a boat trip. Entry can carry a small fee. More in the Aow Leuk guide and the Aow Leuk dive site page.

Tanote Bay has free, easy beach access on the east coast. Expect plenty of small fish, clams, sea stars and a small wreck, plus a chance of turtles or sharks further out. It is a good morning stop. Details in the Tanote Bay guide and the dive site page.

Hin Wong Bay is a wild boulder bay on the east side, reached by a steep concrete road. The southern side is the best for snorkelling, with coral heads, shoals of fish and sometimes blue-spotted rays. Currents can be stronger in rough weather, so stay close to the rocks and enter from the sand. Read more on the Hin Wong Bay page.

Mango Bay sits on the north coast, with a roped-off snorkel zone on the east side, coral-covered boulders and a sandy bottom where you can spot rays, barracuda and sometimes seahorses. It is easiest by boat. By land you drive a steep road to a resort that charges an entrance fee. See the Mango Bay guide and dive site page.

Freedom Beach has a shallow reef near the rocks at the southern end of the bay and more fish if you swim out around the headland. Be mindful of the swell on windy days. There is more in the Freedom Beach guide.

Sai Nuan (two small beaches on the west coast) has shallow, protected water, large boulders full of fish and a few hard corals. Many locals call it one of the safest places on the island to snorkel with children or nervous swimmers. The quieter, less developed end is usually the better one. See the Sai Nuan guide.

Boat spots: Nang Yuan, Twins, Lighthouse Bay and Laem Thian

Japanese Gardens (Koh Nang Yuan) is the classic. A shallow, buoyed-off snorkel zone with coral heads, clownfish, parrotfish and giant clams, and you can swim straight in from the sand. A longtail from Sairee takes about 20 minutes and is cheaper when shared. You also pay the island entrance fee, and plastic bottles are not allowed. The sandbar floods at high tide, and the shallow lagoon on the south-east side can be too thin to swim at low tide, so check the tide before you pay for a taxi. Arrive early or late to avoid tour groups. See the Japanese Gardens page and the Koh Nang Yuan guide.

Twins is mainly a dive site, a trio of granite pinnacles just off Nang Yuan with a shallow top around 5 m. It is not a standard snorkel stop, and it is busy with dive boats, so most snorkellers skip it. If a tour does stop nearby, stay with your guide and keep clear of boat lanes. See the Twins dive site page.

Lighthouse Bay is a small, sheltered bay at the north-east tip with roped snorkel areas near the shore, dense table coral at 3 to 6 m and turtles that often feed in the shallows. It is boat access only. The calm months are March to October. See the Lighthouse Bay page.

Laem Thian is a rocky east-coast headland, reached by boat from Hin Wong. Only the sheltered bay on the south side suits snorkellers, and the cave area is for divers. It is best from June to September, when the east coast is calm. Intermediate swimmers only. See the Laem Thian page.

Round-the-island snorkel tours

A full-day boat trip is the easiest way to see the bays that have no real road access. Most trips run daily, leave from Mae Haad or Sairee, and visit about four or five stops. A typical day looks like Shark Bay for turtles, then Aow Leuk or Hin Wong, a lunch stop near Mango Bay, then Koh Nang Yuan in the afternoon. The route is set by the captain on the day, depending on wind and sea state, so expect the order to change.

• Options: group boats are the standard choice, while premium small-group boats and early departures cost more.
• Usually included: mask and snorkel, a guide, life jackets, lunch, fruit and drinks, and hotel pick-up. Check whether the Nang Yuan entrance fee is included, because it often is not.
• Private longtail: if you want your own pace, you can hire a private boat that includes Nang Yuan. Speedboats and VIP cruises cost more again.
• Booking: in busy months book a day ahead. You can compare our island trips and the activities and services list.

Stops and times change, so confirm them when you book.

Gear rental and what to bring

Most guesthouses, dive centres and small shops rent a mask and snorkel by the day, and fins for a little extra. Fit matters more than brand, so try the mask on your face and breathe in through your nose with no strap. If it holds, it fits. A rash vest, a dry bag and fresh water make the day better, and a cheap set bought in Sairee or Mae Haad pays for itself fast if you snorkel often. Many tours do not allow fins around Nang Yuan, so ask first.

Reef-safe behaviour

Koh Tao's reefs are healthy in places and fragile in others. These habits keep them that way:

• Never stand on coral, even dead-looking coral. Walk out on sand and swim over the reef.
• Do not touch, chase or feed fish, turtles or sharks. Keep at least a couple of metres away from turtles and let them surface.
• Stay horizontal and use a life vest if you are not confident. Kicking and standing both break coral.
• Use a reef-safe sunscreen without oxybenzone or octinoxate, or wear a rash vest and leggings instead. Put cream on at least 15 minutes before you swim. Some operators allow only eco-friendly sunscreen on board.
• Take everything back out with you. Plastic bottles are banned on Nang Yuan.

For the wider picture, see our guide to Koh Tao conservation and volunteering.

Safety: boats, currents and life jackets

Most snorkelling incidents here come from three things: boat traffic, currents and tiredness.

• Boat traffic: longtails, dive boats and speedboats move fast near the bays. Stay inside roped zones where there are any, wear a bright rash vest or tow a float, and keep your head up when you cross a channel.
• Currents: bays like Hin Wong and the points around Shark Bay can pull you out when the wind picks up. Swim along the shore, not away from it, and turn back before you feel tired.
• Life jackets: non-swimmers and children should wear one. Tour operators supply them, and it is a good idea even for confident swimmers on a long day.
• Buddy and phone: tell someone where you are going and never snorkel alone on a remote beach.

Save our emergency numbers and ask your accommodation about the nearest clinic and hyperbaric chamber before you head out.

Seasons and visibility

March to September gives the best and calmest snorkelling, with clear water on most bays. March and April are usually the clearest. From June to August the west coast can get windy, but the east coast stays calmer, and turtle sightings are good. Late September and October are often calm too, though rain starts to cloud the water. November and December bring the monsoon swell, murky water and stronger currents on exposed bays, so skip the east coast on rough days and head for Aow Leuk or Sai Nuan instead. For month-by-month detail see Koh Tao diving by month and the best time to visit Koh Tao. Visibility drops after heavy rain, so wait a day or two if you can.

Snorkelling on Koh Tao: frequently asked questions

Checked in November 2026. Opening hours and timetables change: confirm locally before you go.