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Snorkeling in Koh Lanta

Nestled in the crystal-clear waters of the Andaman Sea lies the tropical paradise of Koh Lanta, a haven for snorkeling enthusiasts.

With its vibrant coral reefs, diverse marine life, and serene underwater landscapes, Koh Lanta offers an unforgettable snorkeling experience.

Whether you're a seasoned snorkeler or a beginner, the warm waters of Koh Lanta beckon you to discover the wonders of the sea.

From the stunning Hin Daeng and Hin Muang dive sites to the tranquil coves and bays along the coastline, there is no shortage of spectacular snorkeling spots to explore.

In this complete guide to snorkeling in Koh Lanta, we'll provide you with all the information you need to plan an unforgettable adventure, from the best time to visit, the gear you'll need, and the top snorkeling spots to check out.

A tourist enjoying snorkeling in Koh Lanta

Best Time to Snorkel in Koh Lanta

The best time to go snorkeling in Koh Lanta is during the dry season, from November to April.

The sea is calm and clear during this time, and the visibility is excellent. However, the peak tourist season is also, so the beaches and snorkeling spots can get crowded.

If you prefer a quieter experience, you can visit Koh Lanta during the monsoon season, from May to October.

The sea can be rough during this time, but marine life is more active, and you can see more fish species.

Snorkeling during the dry season

Best Snorkelling Spots in Koh Lanta

The best snorkeling spots in Koh Lanta are as follows:

Koh Rok

Koh Rok is a stunning snorkeling spot located in Koh Lanta, Thailand.

The island is part of the Mu Koh Lanta National Park and is renowned for its crystal-clear waters, abundant marine life, and colorful coral reefs.

The island consists of two main beaches, Koh Rok Nai and Koh Rok Nok, which offer some of the best snorkeling opportunities in the area.

When you arrive at Koh Rok, you will be struck by the beauty of the island's turquoise waters, which are incredibly clear and allow excellent visibility when snorkeling.

The underwater landscape is filled with vibrant corals of all colors, shapes, and sizes, providing a home for many marine creatures, including tropical fish, sea turtles, and even blacktip reef sharks.

One of the highlights of snorkeling at Koh Rok is the opportunity to see schools of colorful fish, such as angelfish, parrotfish, and clownfish, swimming among the coral.

There are also plenty of other interesting sea creatures to discover, including octopuses, cuttlefish, and sea stars.

In addition to the incredible marine life, Koh Rok is also known for its stunning scenery above the water.

The island's white sand beaches and lush green vegetation provide a picturesque backdrop for your snorkeling adventures.

The Koh Rok snorkeling spot in Koh Lanta

Koh Ngai

This island is located just south of Koh Lanta and is known for its beautiful beaches and clear waters. It is also known as Koh Hai.

Koh Ngai is a popular destination for tourists enjoying pristine beaches, crystal-clear waters, and abundant marine life. As a snorkeling spot, Koh Ngai is fantastic.

The waters around the island are teeming with vibrant coral reefs, colorful fish, and other sea creatures.

Snorkelers can expect to see a wide variety of fish species, such as clownfish, parrotfish, and angelfish, as well as turtles, rays, and even small sharks.

Several excellent snorkeling spots around Koh Ngai, such as the coral garden just off the island's western shore.

Here, snorkelers can explore a shallow reef system home to diverse marine life, including many hard and soft corals.

Another popular spot is the Hin Daeng and Hin Muang dive sites, just a short boat ride from Koh Ngai.

These sites are famous for stunning underwater topography, including deep drop-offs and towering underwater pinnacles.

The Koh Ngai Island in Koh Lanta

Koh Kradan

It is widely regarded as one of the best snorkeling spots in the region due to its clear turquoise waters and rich marine biodiversity.

When snorkeling at Koh Kradan, you can expect to see a variety of colorful tropical fish, sea turtles, and even reef sharks if you're lucky.

The coral reefs around the island are well-preserved and offer a diverse range of habitats for marine life.

One of the best spots for snorkeling at Koh Kradan is the island's eastern side, where you can find a shallow coral garden perfect for beginners.

The water is calm and transparent, making it easy to see the many species of fish and coral.

Another great spot is the southern tip of the island, where you can find deeper waters and larger schools of fish.

Koh Kradan Island in Koh Lanta

Hin Daeng and Hin Muang

Hin Daeng and Hin Muang are two of the best snorkeling spots in Koh Lanta, located in the Andaman Sea in southern Thailand.

Hin Daeng, which means "Red Rock" in Thai, is a popular dive site offering excellent snorkeling opportunities.

It is a large underwater pinnacle that rises from the sea floor to a depth of 60 meters, with the shallowest part of the reef starting at around 5 meters deep.

The site is famous for its vibrant and diverse marine life, including schools of tropical fish, moray eels, reef sharks, and manta rays.

Hin Muang, which means "Purple Rock," is another popular dive and snorkeling site located just a short distance from Hin Daeng.

It is a deep underwater pinnacle that drops to a depth of 70 meters, with the shallowest part of the reef starting at around 15 meters deep.

The site is home to abundant hard and soft corals and large schools of pelagic fish, such as barracuda and tuna.

Hin Daeng and Hin Muang are known for their crystal-clear waters, making them ideal for snorkeling.

However, due to the depth of the sites, snorkeling is only recommended for experienced swimmers or those accompanied by a guide.

Hin Daeng in Koh Lanta

Tips for Snorkelling in Koh Lanta

Here are some tips to ensure a safe snorkeling experience in Koh Lanta.

Choose the Right Time and Location

The best time to go snorkeling in Koh Lanta is during the dry season, between November and April.

During this time, the sea and the water are calm, making it easier to see marine life. Also, choose a snorkeling spot that suits your experience level.

Wear the Right Gear

When snorkeling in Koh Lanta, it is essential to wear the right gear.

This includes a properly fitting snorkel mask, fins, and a snorkel. Ensure your mask fits snugly around your face and does not leak.

Fins will help you move through the water more efficiently, and a snorkel will allow you to breathe while your face is underwater.

Snorkeling with the right gear

Practice Proper Snorkelling Technique

Before entering the water, it's essential to practice proper snorkeling techniques.

Breathe slowly and steadily through the snorkel, and keep your mouth closed to avoid swallowing seawater.

Use your fins to propel yourself through the water and keep your arms relaxed by your sides.

Respect Marine Life

While snorkeling in Koh Lanta, it's essential to respect marine life.

Avoid touching or disturbing any creatures you encounter; do not stand on or touch the coral reef. Remember that you are a guest in their habitat.

Snorkel with a Guide

If you are new to snorkeling or unfamiliar with the area, it's a good idea to snorkel with a guide.

They can point out interesting marine life and ensure you snorkel in a safe area. Additionally, a guide can provide information about the marine life and ecosystem in the area.

Snorkeling with a Guide

Stay Safe

Always snorkel with a buddy and communicate your intentions and whereabouts. Avoid snorkeling in areas with strong currents or surf. If you feel tired or uncomfortable, return to shore immediately.


Snorkeling is definitely among the top-5 things to do in Koh Lanta. It is a fantastic experience you should not miss if you visit the island.

With its crystal-clear waters and diverse marine life, Koh Lanta offers some of the best snorkeling spots in the region.

Follow the tips above and enjoy your snorkeling adventure in Koh Lanta!

Noah Zaidi is an ardent traveler who has been documenting her Thailand exploration through Thailand Nomads. Her aim is to inform and educate people around the world about the must-visit places in Thailand.