The Sahara desert is located in northern Africa, covering around 3.3 million square miles or 25% of the continent. It is inhabited by nomadic tribes like the Taureg who trade goods like gold, ivory and salt. Life is difficult in the desert - food consists mainly of camel milk, dates and porridge. Oases are important as they provide water to communities. The climate is very hot with little rainfall, though seasonal rivers and sand dunes cover much of the landscape. A variety of wildlife has adapted to the harsh conditions.