In oases in the Algerian Sahara, subterranean aqueducts irrigate groves of date palms, fruits, and vegetables. Here, they are called foggaras rather than qanats. The aqueducts tap into upland spring waters and follow subsurface topography downhill until they emerge, to be carefully divided into channels, as seen here in the town of Akabli, that continuously supply thirsty crops. The ancient system faces the double threat of falling water tables and the challenge of recruiting young people for the difficult job of maintaining it.
