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GEO-3: GLOBAL ENVIRONMENT OUTLOOK  
UNEP Website GEO Home Page
Precipitation, evaporation and run-off by region (km3/year)

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Height of bars shows total precipitation; darker areas represent evaporation while lighter areas show run-off. Total annual precipitation on land is 119 000 km3, of which 72 000 km3 evaporates, leaving some 47 000 km3 of run-off

Notes: regions do not correspond exactly to GEO regions; run-off includes flows to groundwater, inland basins, and ice flows of Antarctica

Source: Shiklomanov 1993

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