"Just the Bedouin and us, crisscrossing the Forty Days Road."
"The historic Forty Days' Road connected the el-Fasher area of Sudan with Assiut in Egypt, via the Selima and Kharga Oases. This was the path followed by the great ancient camel caravans of old, a trade route dating back at least 700 years."
The above quote comes from an article called Riding the Forty Days' Road, by Angela Stephens.
In Search of the Forty Days Road by Michael Asher