The sandstone formations date back approximately 130 million years to the Mesozoic Era.
The distinct mushroom shape is the result of differential weathering, where the softer lower pedestal erodes faster than the harder, cap-like iron-rich sandstone top.
Local geological surveys suggest the area was once part of a massive river system that predates current local topography.
The site contains fossilized seashells embedded within the sandstone layers, indicating the region was once submerged under a shallow sea or large lake.
Sao Chaliang consists of unique, mushroom-shaped sandstone rock formations located in Pha Taem National Park. These geological features were formed through centuries of erosion caused by wind and water on massive sandstone sedimentary layers. The site highlights the natural history of the Khorat Plateau, with the stones showcasing visible, layered deposition patterns. The mushrooms reach several meters in height, creating a natural open-air gallery. Similar formations are scattered throughout the surrounding woodland, though the primary cluster is centrally accessible. The site is a primary geological landmark within Ubon Ratchathani province.
Position your camera low at the base of the largest mushroom formation to exaggerate its height against the blue sky.
Wear sturdy walking shoes to navigate the sandy and uneven terrain around the formations.
Bring a hat and sunscreen, as the area has minimal natural shade.
Combine your visit with the nearby cliff-side rock art sites within the national park.
Avoid visiting during the midday heat as there is no significant shelter, and do not attempt to carve names into the soft sandstone.
Do not climb, sit on, or touch the rock formations to prevent further erosion and damage to the fragile surface.
