Chahkuh gorge is on the north-western part of the island not far from Table Village. This Geosite is an exceptional example of erosion through rainstorm water. Heavy rainstorms (that are also rare) quickly flush water through geological structures. Erosion however has been a secondary factor in forming this beautiful valley In fact, it has primarily been affected by the Salt Dome and related anticline. An anticline is a fold that is convex up and formed
due to tectonic compression. While under pressure, these arch-like structures may break in areas that are weaker, forming grooves on the walls. Chahkuh has been initially formed by these geological phenomena, and secondarily been washed away by erosion. Vertical to the main valley axis, there is a second valley, which has also been formed through tectonic pressures. In general, anticlines and areas around them could be counted as «unstable”
as they are more or less exposed to tectonic pressures and compression causing numerous joints and faults in formations.
The presence of concave and round structures or linear and oval structures on the walls of the valley is the result of erosion by water. One of the main characteristics of geological formation of this geosite is its impermeability to water, which keeps the water in holes and grooves, causing further erosion. The locals have taken advantage of this structure by digging wells inside the main axis of the valley to act as water reservoirs. Considering the low level of rainfall on the island, and the scarcity of freshwater, this was a very innovative way to gather water from rainstorms and use it during dry seasons. Chahkuh is aesthetically very attractive, and it is very important to warn the visitors against writing any graffiti on its walls.