Ounianga Serir

The Lakes of Ounianga are located in the Ennedi region of northeastern Chad, deep in the hyper-arid Sahara Desert. Ounianga Serir is the southeastern group within this lake system, separated from the larger Ounianga Kebir cluster by dunes and rocky terrain. Despite receiving virtually no rain, the lakes persist year-round, fed by fossil groundwater from aquifers that date back to a period when the Sahara was much wetter.

Yes, the Lakes of Ounianga were inscribed as a UNESCO World Heritage Site in 2012 under the designation 'Lakes of Ounianga,' recognizing their exceptional natural value as a series of permanent lakes in a hyper-arid environment. UNESCO cited the lakes as a remarkable example of a relict ecosystem surviving in one of the driest regions on Earth. The inscription covers both the Ounianga Kebir and Ounianga Serir lake groups.

The lakes are sustained by underground fossil groundwater from the Nubian Sandstone Aquifer system, a vast reservoir dating back to a humid period thousands of years ago when the Sahara had significantly more rainfall. Because evaporation rates in the region are extreme, the water is gradually depleting, and some lakes are highly saline. The balance between groundwater inflow and evaporation determines each lake's size, salinity, and ecological character.

Ounianga Serir's lakes are generally smaller and more numerous than those around Ounianga Kebir, and they are separated from each other by dunes and patches of vegetation rather than open water. Some of the Serir lakes are highly saline while others support freshwater vegetation and reed beds, creating micro-environments within the desert landscape. The Serir group's more fragmented configuration makes it visually and ecologically distinct from the larger, more continuous water bodies of Kebir.