El Oued is known as the City of a Thousand Domes — and when you see it from above, you understand why. Every building in the old town is topped with a small white dome, a traditional design that keeps interiors cool in the fierce Saharan heat. The effect, spreading across the valley of the Oued Souf, is unlike anything else in Algeria or anywhere else in North Africa.
The town sits at the edge of the Grand Erg Oriental, the vast sand sea of eastern Algeria, and its economy runs on dates — the Souf valley's ingenious ghout farming system sinks gardens into craters dug down to the water table, allowing date palms to grow in the middle of the desert. You can see these sunken gardens around the outskirts of town. The central market is lively and colourful, with dates, spices, and desert roses (natural gypsum crystal formations found in the surrounding sand). The Sidi Salem mosque just west of the centre, with its cluster of small white domes, is the spiritual heart of the Souf.
El Oued is reached by road from Biskra or Touggourt, or by air from Algiers. The town is hot — summer temperatures regularly exceed 45°C — so visit between November and March if you can. The Thursday market is the biggest of the week.