Ranong Province

[email protected] from Phuket, Thailand / Wikimedia Commons (CC BY 2.0)

Also known as Monkey Beach, this secluded bay on the northern tip of Koh Phayam features rocky outcrops that host a variety of marine life. The water is generally clear, and the reef is accessible directly from the sand at low to mid-tide.

Access. Accessible by motorbike followed by a short hike down a jungle path; shore entry.

Notes. Currents can be present; check local conditions before entering the water.

Phuket Province

Tuderna / Wikimedia Commons (CC BY 3.0)

Tucked away near Nai Harn, this rocky bay offers excellent shore snorkeling with a mix of granite boulders and coral patches. It is a quiet alternative to Phuket's crowded beaches, providing clear water and a high density of reef fish.

Access. Accessible by car or motorbike via a small road through the Phuket Yacht Club; shore entry is easy from the rocky beach.

Notes. Snorkeling is best during the dry season (November to April) when the water is calm.

Surat Thani Province

[email protected]… / Wikimedia Commons (CC BY-SA 3.0)

A sheltered coral garden on the south side of Koh Nang Yuan with shallow, calm water and hard-and-soft corals in the 2–12 m range. The protected setting and clear Gulf water make it ideal for relaxed reef snorkeling among parrotfish, angelfish, and bommies. One of the Gulf of Thailand's best beginner-friendly reef sites.

Access. Day trip to Koh Nang Yuan by longtail from Koh Tao (~15 min); island entry fee applies. Snorkel directly from the beach; gear rental on Nang Yuan or bring from Tao.

Notes. Koh Nang Yuan marine rules prohibit single-use plastics; crowded mid-morning when speedboats arrive.

Satun Province

Andy Mitchell from Glasgow, UK / Wikimedia Commons (CC BY-SA 2.0)

A forested island opposite Koh Lipe with quiet bays and fringing reef in clear water away from Lipe's bustle. Day-trip snorkelers explore healthy coral slopes with reef fish, and occasional turtle sightings, on the west and south coasts. A natural complement to Lipe's house reefs.

Access. Longtail boats from Koh Lipe (~15–20 min); half-day snorkel tours with gear rental arranged at Pattaya Beach or Sunrise Beach. Some hikes combine jungle viewpoints with snorkel stops.

Notes. Tarutao National Park fees apply on tours. Few facilities on Adang—bring water and sun protection.

Trang Province

Tournasol7 / Wikimedia Commons (CC BY-SA 4.0)

Known for its exceptionally clear water and vibrant shallow reefs, Koh Kradan offers some of the best snorkeling in the Trang archipelago. The reef stretches along the eastern side of the island, featuring diverse hard corals and abundant tropical fish easily accessible from the beach.

Access. Accessible by long-tail boat or speedboat from Pak Meng Pier on the mainland or via island-hopping tours from Koh Lanta.

Notes. The best snorkeling is found at high tide; be mindful of boat traffic near the shore.

Surat Thani Province

lanjan / Wikimedia Commons (CC BY-SA 3.0)

Connected to Koh Phangan by a scenic sandbar, Koh Ma is framed by a protected marine sanctuary with some of the island's best coral reefs. Snorkelers can simply wade off the beach to explore gardens of staghorn coral and schools of colorful fish.

Access. Direct shore entry from Haad Salad or the sandbar itself. Snorkel gear is readily available for rent at the nearby beach resorts.

Notes. Currents can sweep across the sandbar during changing tides; check conditions before venturing far out.

Trang Province

Daniel.cada / Wikimedia Commons (CC BY-SA 3.0)

This tranquil island offers easy shore-entry snorkeling right off its powdery east-coast beaches. Shallow coral patches host reef fish, parrotfish, and occasional sea anemones just a short swim from the sand.

Access. Accessible via longtail boat or ferry from Trang or Lanta. Snorkel gear can be rented at most beachfront resorts, and day-trip longtails are readily available to hire for exploring nearby reef drops.

Notes. Be cautious of boat traffic near the main piers and check local marine park entry fees.

Krabi Province

Александр Ф / Wikimedia Commons (CC BY-SA 3.0)

Part of the Hat Noppharat Thara-Mu Ko Phi Phi National Park, these dramatic limestone karst islands feature clear turquoise shallows and rich coral gardens. Snorkelers can wade right in from sandy beaches to spot colorful damselfish and butterflyfish.

Access. Easily visited via join-in or private longtail boat tours departing from Ao Nang Beach or Railay. Gear rental is included with most organized day trips.

Notes. Can get busy with day-trippers during peak morning hours; early morning departures offer the clearest, calmest conditions.

Trang Province

Vaclav Zrno / Wikimedia Commons (CC BY 3.0)

Twin national-park islands linked by a shallow channel with some of the Andaman Sea's healthiest fringing reef. Day-trip snorkelers see extensive hard coral, sea snakes, reef sharks, and brilliant fish life in water that often exceeds 20 m visibility. A flagship Thailand reef snorkel.

Access. Speedboat day tours from Koh Lanta (Nov–Apr season); gear, lunch, and park fees typically included. No overnight stays—park closes outside high season.

Notes. Mu Ko Lanta National Park fee applies; sea snakes are venomous but docile—do not provoke. Seasonal closure May–October.

Phang-nga Province

::::=UT=:::: / Wikimedia Commons (CC BY-SA 3.0)

Remote Surin Islands park reefs north of the Similans offer pristine coral and fewer crowds in exceptionally clear water. Snorkelers see extensive reef flats, sea turtles, and dense fish schools on guided boat stops around Koh Surin Nuea and Koh Surin Tai. Among Thailand's best-preserved Andaman reefs.

Access. Day trips and overnight packages from Khao Lak and Kuraburi (Nov–Apr); Moken village tours sometimes combine cultural and snorkel stops. Gear provided on tours.

Notes. Park fees apply; seasonal closure May–October. Strong sun and limited shade on boats—bring protection.

Trat Province

Александр Ф / Wikimedia Commons (CC BY-SA 3.0)

Koh Wai is a quiet island in the Trat province known for its extensive, shallow coral reefs that are perfect for snorkelers of all levels. The reefs are vibrant and sit just meters from the shore, offering a tranquil environment away from mass tourism.

Access. Accessible by ferry or speedboat from Laem Ngop Pier near Trat.

Notes. The island has limited electricity and a slow pace, making it ideal for those seeking undisturbed nature.

Krabi Province

Tuderna / Wikimedia Commons (CC BY 3.0)

Known for regular sightings of harmless blacktip reef sharks patrolling the shallow drop-offs, this vibrant limestone-framed site boasts healthy hard corals and abundant marine life. Snorkel tours regularly stop here for memorable encounters.

Access. Reached via speedboat or longtail boat excursions departing daily from Koh Phi Phi Don or Phuket. Tour operators provide all necessary snorkeling equipment.

Notes. Currents can sometimes be moderate; staying close to your guide or boat is recommended.

Phang-nga Province

Mozhar / Wikimedia Commons (CC BY-SA 3.0)

Granite boulders and fringing reefs in a remote national park deliver gin-clear water and prolific reef fish above hard-coral gardens. Snorkel stops like Donald Duck Bay and East of Eden combine dramatic scenery with easy floating over healthy reef. A classic liveaboard and day-trip Andaman destination.

Access. Day boats and liveaboards from Khao Lak and Phuket (Nov–Apr); park entry fee and snorkel gear included on most packages. All sites are boat-accessed.

Notes. Similan National Park is seasonally closed May–October. No touching coral or marine life; park rangers patrol the islands.

Satun Province

::::=UT=:::: / Wikimedia Commons (CC BY-SA 3.0)

Koh Lipe's east-coast house reef starts metres from the sand in warm, clear water over hard coral and reef fish. Shore entry lets you snorkel independently at your own pace, with the Adang-Rawi archipelago visible offshore. A easy, high-quality base for self-guided reef exploration.

Access. Walk in from Sunrise Beach bungalows and resorts; snorkel gear rental at beachfront shops. Longtail day trips to outer reefs also depart from the island.

Notes. Tarutao National Park zone—avoid standing on coral in the shallows. Boat traffic near the beach in high season.

Surat Thani Province

fawasp / Wikimedia Commons (CC BY 3.0)

An east-coast Koh Tao bay framed by granite boulders with clear water, coral channels, and reef fish from 2–15 m. Calm days bring excellent visibility and the chance to spot juvenile reef sharks on the sandy mouth. A step up from Sairee for snorkelers wanting more structure.

Access. Scooter or taxi from Mae Haad (~20 min); shore entry from the main beach with snorkel rental at bay restaurants. Longtail boats also drop snorkelers here.

Notes. Cliff-jumping and day-trip traffic on the surface; blacktip reef sharks are wild—observe from a distance.