At Koh Hong you see a perfect example of a cross-sectioned phreatic cave. The eventual disintegration of these caves is the basic process in forming the islands of Phang Nga. The Hole in the wall is at least 400 meters above sea level. It slopes down toward the camera and is about 15 meters wide. The hole in the ridge is all that remains of an extensive drainage system that was higher than the hole and extended at least a kilometer beyond Penak's West Coast of today.
Before they became islands, Phang nga Bay was a mountain range whenever the sea levels sank (as much as 120 meters). Fresh water rivers ran through the forests and marshlands, attacking the limestone when it was far above the sea.
See you on the water,
Ling Yai (Thai for 'Big Monkey') AKA John Caveman Gray
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