Satun Geopark, designated a UNESCO Global Geopark in 2018, covers the entire Satun province and documents an extraordinary record of geological history from the Cambrian period to the present. The province's distinctive limestone karst — reminiscent of Phang Nga Bay but largely unvisited — was formed from ancient marine sediments and contains fossil beds that scientists have been studying since the 1980s.
The geopark's most accessible sites are around the town of La-ngu (about 40 km north of Satun) and along the coast where the limestone meets the Andaman Sea. The geopark information centre in Satun town can direct visitors to the key sites. This is not a destination for casual tourists but for anyone with an interest in geology or natural history it is one of the most significant sites in Thailand.