Saturday, 20 September 2008

20 Most Incredible Desert Oases

An oasis is a fertile tract of land that occurs in a desert wherever a permanent supply of fresh water is available. Oases vary in size from about 2.5 acres around small springs to vast areas of naturally watered or irrigated land.

Underground water sources account for most oases; their springs and wells are supplied from sandstone aquifers whose intake areas may be more than 500 miles away.

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