This September 2012 photo shows tracks from four-wheel drives lining the Great Sand Sea, a vast desert with huge rolling sand dunes that span the Egyptian and Libyan frontiers in the Egyptian oasis of Siwa, a Berber town of some 27,000 people roughly 450 miles (about 725 kilometers) southwest of Cairo. The palm tree-lined area is known for its quiet charm, ancient ruins, abundant natural springs, a vast salt lake and rolling sand dunes in the surrounding desert. (AP Photo/Kim Gamel)

Associated Press
This September 2012 photo shows tracks from four-wheel drives lining the Great Sand Sea, a vast desert with huge rolling sand dunes that span the Egyptian and Libyan frontiers in the Egyptian oasis of Siwa, a Berber town of some 27,000 people roughly 450 miles (about 725 kilometers) southwest of Cairo. The palm tree-lined area is known for its quiet charm, ancient ruins, abundant natural springs, a vast salt lake and rolling sand dunes in the surrounding desert. (AP Photo/Kim Gamel)
This September 2012 photo shows tracks from four-wheel drives lining the Great Sand Sea, a vast desert with huge rolling sand dunes that span the Egyptian and Libyan frontiers in the Egyptian oasis of Siwa, a Berber town of some 27,000 people roughly 450 miles (about 725 kilometers) southwest of Cairo. The palm tree-lined area is known for its quiet charm, ancient ruins, abundant natural springs, a vast salt lake and rolling sand dunes in the surrounding desert. (AP Photo/Kim Gamel)
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