Ko Thalu is an island that combines natural beauty both above and below the water. It is one of the “four islands” that tourists usually visit on snorkeling tours in Chumphon.

Above the water, the island’s most prominent feature is a large cave passage that pierces through the island. Visitors can swim or take a small boat through this passage, creating an exciting experience and a unique photo opportunity. The island is composed of limestone cliffs with no sandy beaches, but the crystal-clear turquoise water and dramatic rock formations make it visually stunning.

Below the water, Ko Thalu is a top snorkeling and diving spot suitable for divers of all levels. Visitors can admire soft corals, hard corals, and a wide variety of colorful fish up close. Around the island, schools of fish such as silver-and-gold butterflyfish, fusiliers, and emperor angelfish gather, along with coral reefs that are exceptionally healthy and colorful.

Tourists usually visit Ko Thalu as part of a one-day island-hopping tour that includes nearby islands such as Ko Ngam Noi, Ko Ngam Yai, and Ko Khalok. Boats to these islands are typically speedboats or long-tail boats departing from piers near Thung Wua Laen Beach or Pak Nam Chumphon.

• Visitors can purchase boat tickets from Siam Catamaran Co., Ltd. (Tel. 081-5366808) or from tour counters at nearby hotels, such as those in Chumphon town. Boats depart from piers near Thayang Pier operated by various tour companies.

• Visitors can also charter a private boat from Chumphon Marine National Park by contacting the park office for booking and inquiries.

• Travel during the calm season, usually from December to April, for safer and clearer waters.

• Bring your own snorkeling gear and reef-safe sunscreen.

• Always follow the guide’s instructions, especially when swimming through the cave passage, as currents may be strong in some areas.

• Chumphon island tours are generally eco-friendly to protect coral reefs and the marine ecosystem.

• Keep the environment clean do not leave trash behind and respect marine life.

Admission fee

As Ko Thalu is within Mu Ko Chumphon National Park, visitors must pay the park entrance fee (boat costs not included)

• Thai adults: 40 THB / Children: 20 THB

• Foreign adults: 200 THB / Children: 100 THB

Opening Hours

• The island is open for visits and water activities according to tour schedules, typically from 08:00–16:00.