Trans-Saharan trade is trade between sub-Saharan Africa and North Africa that requires travel across the Sahara. Though this trade began in prehistoric times, the peak of trade extended from the 8th century until the early 17th century CE. The Sahara once had a different climate and environment. In Libya and Algeria, from at least 7000 BCE, pastoralism, large settlements and pottery were present. Cattle were introduced to the Central Sahara (Ahaggar) between 4090 to 3500 BCE. Remarkable rock paintings in arid regions portray flora and fauna that are not present in the modern desert.

Oualata or Walata 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.