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Sarah Bruning
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Koh Tao’s sheltered bays offer incredible underwater encounters just steps from the beach, with colorful reefs, giant clams, and marine life for snorkelers of all abilities.
:max_bytes(150000):strip_icc():format(jpeg)/TAL-coral-reefs-koh-tao-thailand-THAISNORKEL1026-544049ee30ff4d24a040c0ed16939ae7.jpg "Sea life swimming through the coral reefs of Koh Tao, Thailand.Credit: Eloi_Omella/Getty Images")
Sea life swimming through the coral reefs of Koh Tao, Thailand.
Credit: Eloi_Omella/Getty Images
Wading into the pale blue water off Koh Tao’s southern coast, you might spot the unmistakable silhouette that gives Shark Bay its name—a blacktip reef shark cruising the shallows. Juveniles are a fixture off the shore of this Thai island, though the species tends to be timid and disappear almost as quickly as you can register them. If you still prefer to give them a wide berth, you can instead seek out the green sea turtles that love to graze on seagrass or rise languidly toward the surface for air. Look even closer, and you’re likely to spot smaller denizens like needlefish hovering just below the surface or pink skunk clownfish darting among the tentacles of sea anemone.
Situated in the Gulf of Thailand, the island is renowned for diving, but snorkeling provides plenty of entertainment closer to the surface. Much of its appeal lies in how different the experience can feel from one cove to the next and how little effort it takes to hit up a few different locales in one trip. Reefs fringe much of the isle, and some of the best snorkeling can be found right off the beach. You might spend one morning with your head on a swivel, casting an eye about for those sharks and turtles; the next, you might scour a coral-wreathed shoreline for much smaller residents like gobies and blennies.
For newer snorkelers, Aow Leuk is a smart place to dip a toe (or face mask) in. The broad bay on the island’s southeast shore slopes gently away from a sandy beach, with calm water and minimal current. Along the rocky edges, boulders of porites and sprawling tables of acropora—two types of stony coral—form a maze-like landscape where squirrelfish mingle with harlequin sweetlips, and blue-spotted ribbontail rays lie so still against the sand that their electric-blue markings are sometimes the only things that give them away. There’s also a giant-clam nursery here, and the reefs harbor parrotfish, rabbitfish, butterflyfish, red-breasted wrasse, and plenty of Christmas tree worms tucked into massive coral heads.
Tanote Bay offers a different kind of terrain. Massive granite boulders continue below the surface, breaking up the reef into ledges, crevices, and coral-covered outcrops that are best appreciated when you slow down. The water drops to around 10 to 13 feet fairly quickly, but under calm conditions, it remains doable for beginners. When visibility works in your favor, you may spy Christmas tree worms unfurling from coral heads or a small moray eel peering from a crack. Tanote Bay is another good place to look for giant clams; scientific surveys have found particularly high numbers of Tridacna crocea (the smallest species of giant clam) in the area.
Mango Bay, on the island’s northern end, is a popular stop that pairs sandy shallows with a reef along the rocky coastline. Hin Wong, on the east coast, feels rougher around the edges, with granite boulders dropping into clear water and patches of coral tucked between them.
That variety also means it pays not to get too attached to a single snorkeling plan. Wind can leave one side of this small island choppy while another bay remains relatively protected. February, March, and September tend to bring especially calm seas; visibility can be excellent at other points from late summer into fall, but conditions matter more than the calendar on any given morning. If you want to cover more ground, full-day snorkel trips and private longtail charters typically string together several bays and can adjust the route depending on the weather.
Still, part of Koh Tao’s appeal is that you don’t have to turn snorkeling into an all-day production if you don’t want to. Pick the right beach and you can walk in with a mask and fins, spend an hour tracing the reef edge, then be back on the sand for an alfresco seafood lunch.
Sea life swimming through the coral reefs of Koh Tao, Thailand.
Credit: Eloi_Omella/Getty Images
Wading into the pale blue water off Koh Tao’s southern coast, you might spot the unmistakable silhouette that gives Shark Bay its name—a blacktip reef shark cruising the shallows. Juveniles are a fixture off the shore of this Thai island, though the species tends to be timid and disappear almost as quickly as you can register them. If you still prefer to give them a wide berth, you can instead seek out the green sea turtles that love to graze on seagrass or rise languidly toward the surface for air. Look even closer, and you’re likely to spot smaller denizens like needlefish hovering just below the surface or pink skunk clownfish darting among the tentacles of sea anemone.
Situated in the Gulf of Thailand, the island is renowned for diving, but snorkeling provides plenty of entertainment closer to the surface. Much of its appeal lies in how different the experience can feel from one cove to the next and how little effort it takes to hit up a few different locales in one trip. Reefs fringe much of the isle, and some of the best snorkeling can be found right off the beach. You might spend one morning with your head on a swivel, casting an eye about for those sharks and turtles; the next, you might scour a coral-wreathed shoreline for much smaller residents like gobies and blennies.
For newer snorkelers, Aow Leuk is a smart place to dip a toe (or face mask) in. The broad bay on the island’s southeast shore slopes gently away from a sandy beach, with calm water and minimal current. Along the rocky edges, boulders of porites and sprawling tables of acropora—two types of stony coral—form a maze-like landscape where squirrelfish mingle with harlequin sweetlips, and blue-spotted ribbontail rays lie so still against the sand that their electric-blue markings are sometimes the only things that give them away. There’s also a giant-clam nursery here, and the reefs harbor parrotfish, rabbitfish, butterflyfish, red-breasted wrasse, and plenty of Christmas tree worms tucked into massive coral heads.
Tanote Bay offers a different kind of terrain. Massive granite boulders continue below the surface, breaking up the reef into ledges, crevices, and coral-covered outcrops that are best appreciated when you slow down. The water drops to around 10 to 13 feet fairly quickly, but under calm conditions, it remains doable for beginners. When visibility works in your favor, you may spy Christmas tree worms unfurling from coral heads or a small moray eel peering from a crack. Tanote Bay is another good place to look for giant clams; scientific surveys have found particularly high numbers of Tridacna crocea (the smallest species of giant clam) in the area.
Mango Bay, on the island’s northern end, is a popular stop that pairs sandy shallows with a reef along the rocky coastline. Hin Wong, on the east coast, feels rougher around the edges, with granite boulders dropping into clear water and patches of coral tucked between them.
That variety also means it pays not to get too attached to a single snorkeling plan. Wind can leave one side of this small island choppy while another bay remains relatively protected. February, March, and September tend to bring especially calm seas; visibility can be excellent at other points from late summer into fall, but conditions matter more than the calendar on any given morning. If you want to cover more ground, full-day snorkel trips and private longtail charters typically string together several bays and can adjust the route depending on the weather.
Still, part of Koh Tao’s appeal is that you don’t have to turn snorkeling into an all-day production if you don’t want to. Pick the right beach and you can walk in with a mask and fins, spend an hour tracing the reef edge, then be back on the sand for an alfresco seafood lunch.