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A thick snake of tan dust slithers across Saudi Arabia, the Red Sea, and Egypt in this dramatic true-color image from 13 May 2005. The dust is so thick that it is completely opaque for well over 1,100 km (700 mi) across its south-moving front, from the border of Iraq, across the Arabian Desert of Saudi Arabia, and eastern Egypt and the green ribbon of the Nile. Click on photo for higher resolution. Image courtesy of NASA.