Where the borders of Egypt, Sudan, and Libya meet, a rugged mountain complex rises from the Sahara. The peaks of Jebel Uweinat reach elevations about 2,000 meters (7,000 feet) above sea level. Geologists exploring Jebel Uweinat have found rock layers that are hundreds of millions of years old, preserving traces of landscapes that were very different from the bone-dry environment that prevails here today. Read More