Lack of water
The Sahara is the largest hot desert in the world and receives very little rainfall. This means that there are few oases, which are places where water can be found. Travelers had to carry their own water with them, which added to the weight of their belongings and made it more difficult to travel.
Extreme heat
The Sahara is also extremely hot, with temperatures often reaching over 50 degrees Celsius (122 degrees Fahrenheit). This heat can be debilitating and can cause travelers to become exhausted and dehydrated.
Sand dunes
The Sahara is covered in sand dunes, which can be difficult to navigate. Dunes can be as high as 300 meters (984 feet) and are constantly shifting, which makes it difficult to find a clear path.
In addition to these physical challenges, travelers across the Sahara also had to contend with the risk of attack from bandits and raiders.
Despite the challenges, people have been traveling across the Sahara for centuries. In fact, the Sahara was once a major trade route between North Africa and the Middle East. Today, it is still possible to travel across the Sahara, but it is important to be prepared for the challenges involved.