Ouadane is an ancient desert city located in the north-central region of Mauritania, in West Africa. The city was founded in the 11th century and served as an important center for Islamic scholarship and trade in the Sahara Desert. It was also a major hub for the trans-Saharan caravan trade, which connected West Africa with North Africa and the Mediterranean world.

The city of Ouadane is famous for its well-preserved medieval architecture, which includes several impressive structures such as the Great Mosque, the ancient fortifications, and numerous houses and buildings made of stone and mud brick. The Great Mosque, in particular, is a stunning example of Islamic architecture and features an ornate minaret that stands out against the barren desert landscape.

Ouadane was designated a UNESCO World Heritage Site in 1996 in recognition of its outstanding cultural value and historical significance. The city remains a popular tourist destination for those interested in exploring the rich history and culture of West Africa, and visitors can wander through the ancient streets and buildings, explore the local markets, and learn about the unique way of life in this remote desert region.