Viking Cave is one of the most notable natural sites on Koh Phi Phi Leh. The cave is located at the foot of a high limestone cliff in the northeast of the island and is only accessible by boat.

Locally called Tham Phaya Nak, the Viking Cave owes its name to the paintings on the east and south walls of the cave - they depict different types of boats, including something resembling a Scandinavian drakkar (Viking ship). A local legend has it that long ago sailors lost their boat during a storm and got stuck without food. But a colony of swifts lived in the cave, and the pirates managed to survive by eating their nests.