Map of hidden water

They are one of the world's greatest and most precious natural resources, yet are entirely hidden. Now, for the first time, a high-resolution fresh water world map (8mb pdf) shows where underground aquifers store vast amounts of water.

The map of "blue gold" is the result of nearly a decade of sometimes difficult talks between neighbouring governments, mediated by UNESCO. The hope is that it will help pave the way to an international law to govern how water is shared around the world.

source : New Scientist, 12:52 24 October 2008 by Catherine Brahic