Oualata or Walata (Arabic: ولاته‎) (also Biru in 17th century chronicles) is a small oasis town in southeast Mauritania, located at the eastern end of the Aoukar basin. Oualata was important as a caravan city in the thirteenth and fourteenth centuries as the southern terminus of a trans-Saharan trade route and now it is a World Heritage Site.

Oualata is believed to have been first settled by an agro-pastoral people akin to the Mandé Soninke people who lived along the rocky promontories of the Tichitt-Oualata and Tagant cliffs of Mauritania facing the Aoukar basin. There, they built what are among the oldest stone settlements on the African continent.

The town formed part of the Ghana Empire and grew wealthy through trade. At the beginning of the thirteenth century Oualata replaced Aoudaghost as the principal southern terminus of the trans-Saharan trade and developed into an important commercial and religious centre. By the fourteenth century the city had become part of the Mali Empire.

An important trans-Saharan route began at Sijilmasa in Morocco and passed through Taghaza with its salt mines and ended at Oualata.

Moroccan explorer Ibn Battuta found the inhabitants of Oualata were Muslim and mainly Massufa, a section of the Sanhaja. He was surprised by the great respect and independence that women enjoyed.

From the second half of the fourteenth century Timbuktu gradually replaced Oualata as the southern terminus of the trans-Sahara route and Oualata declined in importance.

The old town covers an area of about 600 m by 300 m, some of it now in ruins. The sandstone buildings are coated with banco and some are decorated with geometric designs. The mosque now lies on the eastern edge of the town but in earlier times may have been surrounded by other buildings. The French historian, Raymond Mauny, estimated that in the Middle Ages the town would have accommodated between 2000 and 3000 inhabitants. Today, Oualata is home to a manuscript museum, and is known for its highly decorative vernacular architecture. It was made a UNESCO World Heritage Site in 1996 together with Ouadane, Chinguetti and Tichitt.

Read more: https://en.wikipedia.org/wiki/Oualata