Aow Hin Wong on Koh Tao, Thailand is a sheltered bay on the island’s northeast coast known among freedivers, snorkelers, and divers for rocky underwater terrain, coral bommies, and a mix of reef fish. The bay’s relatively calm waters and varied depths make it accessible for surface freediving and snorkel exploration, with common sightings of parrotfish, fusiliers, rabbitfish, sergeant majors and occasional blacktip reef sharks, rays and sea turtles around the reef edges.

Another highlight is Hin Wong Cave or Tham Saeng . It is a narrow cave area located within Aow Hin Wong, where sunlight enters during the afternoon (around 13:00), illuminating the clear blue seawater and revealing stalactite- and stalagmite-like rock formations inside the cave

• Visibility: generally 2–15 m though conditions vary with weather and season

• Depth Range: approximately 2–20 m across the bay

• Water Temperature : around 27–30 °C year-round

• Water Conditions : sheltered bay with typically calm seas; conditions vary with wind and monsoon patterns

• Seasonality : diving and freediving feasible year-round; visibility and sea state generally best March to October, with potential for rougher seas November to January

• Transportation : typically reached by road from central Koh Tao; travelling by scooter or motorcycle from Sairee Beach takes about 10– to the bay access point, followed by a short walk to the shoreline. Boat excursions from Mae Haad Pier also include stops at Hin Wong for snorkeling or diving.

• Local rules : general Thai diving and snorkeling regulations apply; avoid reef and animal contact and follow guidance from local operators