Doi Nang Non

Doi Nang Non is a prominent karst mountain range in Pong Pha, Mae Sai District, Chiang Rai Province, northern Thailand, forming part of the Daen Lao Range near the Myanmar border. Known as the Sleeping Lady Mountain for its silhouette resembling a reclining woman, it lies within Tham Luang–Khun Nam Nang Non National Park and contains the Tham Luang Cave system. The range is notable for its limestone cliffs, forested slopes, viewpoints and cultural legend.

Visitors can expect a forested limestone mountain range with dramatic cliffs and a distinctive reclining-lady silhouette visible from the lowlands. The area is managed as part of Tham Luang–Khun Nam Nang Non National Park with viewpoints, walking trails, and access to the Tham Luang Cave entrance area and Khun Nam Nang Non natural spring. The setting is natural and mountainous with visitor centre, interpretive displays about geology and the cave system, and photo spots overlooking the Mae Sai valley.

Doi Nang Non is associated with a long-standing local legend of a princess (Nang Non) whose reclining form is said to form the mountain ridge. The range contains Tham Luang Cave, a 10 km limestone cave system that gained international attention in June-July 2018 during the rescue of a youth football team. The area was formerly a forest park and was later designated as Tham Luang–Khun Nam Nang Non National Park.

The mountain is culturally significant for its Sleeping Lady legend, which is widely told in Chiang Rai and reflected in the name Khun Nam Nang Non (spring of the sleeping lady). The silhouette is a recognizable local landmark and the spring and cave are regarded as important natural features within local folklore and community identity.