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Ebro Delta. True-colour satellite image of the Ebro (Ebre) Delta (green, centre right) in eastern Spain. North is at top. Dense vegetation is green, sparse vegetation is brown and bare ground is white. The Mediterranean Sea is at right. This fertile delta, covering an area of 32,000 hectares, is mainly used to grow rice. It is now a National Park. The delta has formed from sediment deposited by the River Ebro (which runs south and then east from upper centre) as it slows upon meeting the sea. (KEYSTONE/SCIENCE PHOTO LIBRARY/PLANETOBSERVER)