Hin Wong Bay is located northeast of Koh Tao, and it's one of the largest bays of the island. Numerous dives can be performed here, including a cave dive on the southern part of the bay. The maximum depth is around 18 meters/59 feet.
The marine life includes species such as triggerfish, fusiliers, triggerfish, emperorfish, and the occasional reef sharks, among others.
Diving in Koh Tao is possible year-round, with water temperatures averaging about 27 degrees Celsius (80 degrees Fahrenheit).