Khao Nam Khang Historical Tunnel

Khao Nam Khang Historical Tunnel is a former underground base located in Khlong Kwang Subdistrict, Na Thawi District, Songkhla Province, southern Thailand. Excavated in the 1970s and considered the largest man-made tunnel in Thailand, it extends about one kilometer across three levels. Once used as a shelter and operational base, it now operates as a historical attraction displaying living quarters, meeting rooms and exhibits within a forested hillside setting near the Malaysia border.

Visitors can explore a forested hillside site with an extensive man-made tunnel system extending about 1 kilometer over three interconnected levels. Inside, concrete-lined passages lead to former living quarters, kitchens, meeting rooms, medical room, radio room and storage areas with period exhibits and photographs. The exterior features jungle surroundings, entrance portals, and a visitor area with displays explaining the site's history. Guided walks through dimly lit, cool corridors are the main experience.