Khao Ngum Cave is located at the base of a small limestone hill in Thai Chang Sub-district, Mueang Phang Nga District, an area characterized by a karst landscape formed through the long-term dissolution of limestone. This geological process has created steep limestone cliffs, caves, and rock shelters throughout the region. The cave itself is relatively shallow and resembles a rock shelter rather than a deep cavern. Inside, small stalactites and stalagmites can be observed, formed over time by the gradual deposition of calcium carbonate from mineral-rich water seeping through the rock layers.

The most distinctive feature of the cave is a section of its limestone wall embedded with numerous fossilized sea shells. These fossils are the result of ancient marine sedimentation, indicating that the area was once submerged under the sea millions of years ago. Over geological time, tectonic uplift transformed these marine deposits into the limestone formations seen today. The shells, typically small to medium in size, are densely packed within the rock matrix, providing clear evidence of past marine environments and the natural processes that shaped the region.

From an archaeological perspective, the rock shelter-like structure of Khao Ngum Cave suggests the possibility that it may have been used as a temporary refuge by prehistoric humans, as similar formations in southern Thailand have been associated with early human habitation. However, detailed archaeological evidence from this specific site remains limited, and the cave has not been formally developed or designated as an official archaeological site. Therefore, it is more appropriate to consider it as having "Potential Archaeological" significance rather than confirmed findings.

The surrounding area is shaded by tropical vegetation and maintains a and natural atmosphere, with a small stream flowing nearby during certain seasons, contributing to the ecological balance of the site. Although Khao Ngum Cave has not been developed into a major tourist destination, its proximity to Phung Chang Cave allows visitors to conveniently explore both locations. The site is particularly suitable for those interested in geology, natural history, and the quiet exploration of lesser-known landscapes in Phang Nga.

• From Phang Nga Bus Terminal, take Phet Kasem Road toward the town center for approximately 2 kilometers. Head toward the (old) Provincial Hall area, where the cave is located behind the building near the foothill, close to the entrance of Phung Chang Cave. Accessible by private car or local transport.

• Wear proper walking shoes suitable for natural terrain

• Bring insect repellent due to the humid environment

• Visit during daytime for safety and better visibility

• Be cautious of slippery surfaces during rainy season

Admission Fees:

• No admission.

Opening Hours:

• Open daily 08:30 AM – 04:30 PM.