Khao Nam Khang National Park

Khao Nam Khang National Park is a protected area in Na Thawi District, Songkhla Province, near the Thailand-Malaysia border in southern Thailand. Established in 1991, it covers approximately 212 square kilometres of evergreen forest and hilly terrain. The park is notable for its preserved former underground tunnel complex, dense tropical forest, waterfalls and diverse wildlife, combining natural scenery with historical interest for visitors.

Visitors can expect a forested mountain park with a visitor centre and marked nature trails leading through dense evergreen forest to waterfalls and viewpoints. The main attraction is the extensive three-level underground tunnel complex with living quarters, meeting rooms and kitchens that can be explored on foot with a guide. The environment is quiet and natural, with opportunities for short treks, birdwatching, photography and camping near the park headquarters.

The area served as a base for the Communist Party of Thailand from the 1970s until 1987. An extensive underground tunnel system was constructed as a shelter, command centre and living quarters, and was abandoned after members left the jungle. The tunnels have been preserved and opened for visitors, and the area was declared a national park in 1991.