Hin Daeng is easy to find since it protrudes up out of the water by about three metres. Although not very impressive to look at topside, underneath the water the rock is huge. The southern side descends straight down for more than 60 metres, forming the most radical vertical drop within Thailand's seas. The wall itself is dotted with light growths of soft corals and a few sea fans, but is otherwise devoid of life.
On the eastern side where the slope is gentler, two long ridges descend into the deep blue water, and when the currents are favorable it is possible to swim along these ridges down to a depth of 40 meters plus.
Here the soft coral is taller and particularly lush with huge schools of jacks sweep past the ridge, surrounding divers with a shimmering wall of silver. Ascending to the shallows you can see needle fish (long toms) skipping along the surface, and barracudas stalking their prey through the underwater world.
Swimming is possible between the three large rocks that form the surface view of Hin Daeng, where large schools of fusiliers dart to and fro as if they are afraid of the water surging through the channels.
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