Phu Langka is a National Park in Beung Kahn and Nakhon Phanom Provinces, that covers an area of about 50 km˛.

It is a site of considerable interest for tourists, particularly due to its connection with the naga (fig.) myth and the renowned Naga Cave (fig.).

Tham Naki or ‘Snake Cave’, a large rock shelter, exhibits patterns on its surface resembling naga scales, akin to those found in Naga Cave.