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From the CIA World Factbook
Volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most fresh water), with steep coastal cliffs and narrow coastal plains in north, low hills in center, mountains in south
U.S. Department of the Interior | U.S. Geological Survey
URL: http://earthquake.usgs.gov/regional/world/guam/guam_geography.php
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Page Last Modified: July 16, 2008 20:10:58 UTC
