Rising 300m above the desert floor, and covering an area the size of Switzerland, the Gilf Kebir is one of the most arid and inhospitable places in the Sahara. Located in the Egyptian desert, near the Libyan border a 100km north of Sudan, it shares a latitude with Abu Simbel. For over 100,000 years the Gilf Kebir was home to generations of hunters, followed by two thousand years of use by nomadic herders. It was only re-discovered in 1926, and since then it has been the subject of numerous expeditions for exploration, archaeological and geological investigation and, more recently, tourism. Very remote and arid it remained an almost pristine landscape until recent decades, perfect for field research. Even NASA researchers have studied the Gilf Kebir to evaluate conditions that might prevail on Mars.