Sebha is bound to disappear. The capital of Libya's hydrocarbon-rich Fezzan region has become the largest city in the Sahara. For years, it has seen the convergence of public and private capital, and a steady flow of migrants. Subjected to major demographic pressure, the city of the sands is now doomed. Sooner or later, the lack of water will empty it of its inhabitants — and return its territory to nature.