Hin Nok consists of three huge underwater rocks which are only visible from surface at low tide. The three rocks are forming a shallow inside plateau covered with anemones. On outside boulders and hard corals are surrounded by schools of fish.
The small holes and crevices are home to different type of morreu eels, especially the rare honeycomb moray is spotted very frequently. the maximum depth is around 16 m,visibility ranges between 10-20 m.