The Dolines of the Grand Sud

These submerged cavities are the result of two activities: human and natural. When a doline forms naturally, it is due to the solubility of a mass of soil that eventually collapses after prolonged periods of rain, creating a cavity. Conversely, when a doline forms due to human activity, specifically mining, the excavated cavities become submerged with rainwater and water from the "shallow groundwater table."

So, come discover the Grand Sud by seeking out these curiosities! For researchers...