Tham Phraya Nakhon is located in Sam Roi Yot in Prachuap Khiri Khan. It is probably the most photographed cave in Thailand and can be reached by boat or foot. If you go by foot it's 30 minutes each way by foot along a steep, rocky 430m trail from Hat Laem Sala. The boat trip takes about 30 minutes there and back. The cave is made up of two large sinkholes, and when the sun shines through in the early morning the effect is truly mystical. In one cave there's a royal sala, an ''open room'' with a roof but no walls.
- Open days
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday