Local shepherds discovered this vast expanse of water about three weeks ago. News of the lake’s appearance has spread like wildfire and now hundreds of people, eager to escape a heatwave, go there to swim. They have christened it “Gafsa Beach.” Many people are calling the lake’s appearance a miracle.



So far, local authorities have provided no explanation for the lake’s sudden appearance. That’s why I contacted a geologist working at Gafsa’s college of science who had come up with a number of theories about the lake’s origins, one being that seismic activity upset the water table, causing groundwater to rise to the surface.



For the time being, the origins of this lake remains a mystery, but our biggest concern right now is the quality of the water. This region is overflowing with large deposits of phosphate, which can leave behind radioactive residue [Editor’s Note: The city of Gafsa is located in a valley in the eponymous mountain range. Phosphate mining is the region’s main industry.]



So, there is a real risk that this water is contaminated and carcinogenic. On the first few days, the water was a clear, turquoise blue. Now, it is greenish and filled with algae, sure signs that the water is stagnant, which means it’s a perfect breeding ground for parasites and disease.



Last Friday, despite the warnings issued by the Office of Public Safety, hundreds of swimmers came to the lake. The site is certainly stunning and there are many large rocks perfect for diving. So to truly dissuade people from coming, we’ll need something more convincing than a little warning.