Thailand is a country that is blessed with large tracts of limestone throughout its borders making it a veritable treasure trove of caves, flowstones, stalactites, stalagmites, and other underground formations. Limestone has a quality in that whilst pure water cannot dissolve it rain water can because it has picked up carbon dioxide from the air and soil and turns the limestone into calcium bicarbonate. That process of dissolving creates, river paths, sink holes, swallow holes, grikes and when these areas collapse some spectacular cave systems can be formed. It is estimated that there are around 4000 known caves in Thailand, but even more are undiscovered in the forest protected limestone peaks of the country.
Here is a small sample of their beauty:
To see more images of caves in Thailand, click here