Koh Yang is an integral part of the Dong Islands within the Tarutao National Marine Park in Satun Province, recognized as a primary highlight of the "Inside Zone" tour departing from Koh Lipe. Although it is a relatively small island with limited beach space—making it less suitable for trekking or camping compared to neighboring Koh Adang or Koh Rawi—Koh Yang holds immense ecological significance. It is home to some of the most pristine and well-preserved hard coral reefs in the southern Andaman Sea.

The physical characteristics of the reefs surrounding Koh Yang are notable for their shallow depths and consistent water circulation, providing snorkelers with exceptional underwater clarity. The main attraction is the vast "Lettuce Coral" (also known as Cabbage Coral) fields, which grow in dense, overlapping patterns resembling large underwater floral petals. These formations are interspersed with Staghorn Corals and Porites Corals, creating a complex and robust habitat for a wide array of marine species.

Beyond the coral diversity, the area serves as a vibrant sanctuary for colorful reef fish. Visitors can frequently spot Parrotfish grazing on algae-covered corals, as well as friendly schools of Sergeant Major fish. A quintessential sight at Koh Yang is the Anemonefish, including both the Ocellaris and Skunk species, nestled within sea anemones in the shallow flats. The water's high visibility on clear days transforms Koh Yang into an outstanding natural classroom, offering deep insights into coral reef ecosystems and the vital importance of marine conservation.

• Most visitors reach Koh Yang by renting a private long-tail boat or joining a group tour from Koh Lipe. The boat ride takes approximately 15–20 minutes.

• Always wear a life jacket while snorkeling, as currents can be present in some areas

• Avoid standing on or touching corals, as lettuce corals are extremely fragile

• Wear reef shoes or fins to protect your feet from sharp rocks and corals

• Visit in the morning for the best water clarity and visibility

Admission Fees:

• Thai Nationals: Adults 40 THB / Children 20 THB

• Foreigners: Adults 200 THB / Children 100 THB

Opening Hours:

• Open 24 hours a day, every day.