Diamond Cave (Tham Phra Nang Nai), Railay
Tham Phra Nang Nai, the Inner Princess Cave and usually signed as Diamond Cave, is at the northern end of Railay East, a few minutes from the boardwalk. A raised walkway runs through the chamber, lit well enough to see by.
The name comes from the flowstone: sheets and columns of calcite that catch the light. Some formations are still growing, others have dried out. It is a modest cave by Thai standards and takes twenty minutes, which makes it a reasonable thing to do in the heat of the day or when rain has closed the climbing.
A small entrance fee is collected. The walkway is even but can be slick, and the cave is home to bats - as caves are.
Related Routes
This trip is not available during the selected dates
- Railay East, Krabi — The mangrove-fringed eastern side of the peninsula, where the climbing shops, cheaper rooms and bars are.
- Railay West Beach, Krabi — The wide white beach on the peninsula's western side, closed at both ends by limestone walls.
- Phra Nang Cave Beach, Railay — The finest beach on the peninsula, under a huge overhanging cliff, with the princess shrine at its far end.
- Railay Viewpoint and Lagoon (Sa Phra Nang) — A short, very steep scramble above Phra Nang to a viewpoint over both sides of the peninsula, and a hidden lagoon below it.
- Tonsai Bay, Railay — The climbers' bay north of Railay West, cheaper and rougher, under some of Thailand's hardest routes.






