Tham Pla

Tham Pla, also known as Fish Cave, is a natural cave and forest park in Huai Pha Subdistrict, Mueang Mae Hong Son District, Mae Hong Son Province, northern Thailand. Located about 17 kilometers north of Mae Hong Son town along Highway 1095 within Tham Pla–Namtok Pha Suea National Park, it is famous for its crystal-clear pool inhabited by large soro brook carp and its limestone cave set in forested hills.

Visitors can expect a small forested park centered on a clear spring-fed pool at the mouth of a limestone cave where hundreds of large soro brook carp (Pla Mung) swim. A short walkway and bridge lead to the pool and cave entrance, surrounded by shady trees, limestone cliffs and forest. The cave interior is shallow and can be viewed from the entrance. The area is also inhabited by monkeys and offers photo spots, nature walks and small food stalls.

Tham Pla is part of the Tham Pla–Namtok Pha Suea National Park, established in 2000, protecting forest, watershed and cave systems in northern Mae Hong Son. The cave and surrounding area have archaeological significance with prehistoric remains found in caves of the region.

The fish in the pool are considered sacred and protected by local beliefs; catching or harming them is traditionally forbidden. The site is respected by local communities and is a well-known natural and cultural landmark of Mae Hong Son.