Groundwater Resources of the World, 2006

Caption

Transboundary Aquifer Systems

This world map shows global groundwater resources as of 2006.

Legend:

Transboundary Aquifer Systems
- Red circle: coherent modelling in progress
- Red intermittent circle: additional investigation required
- Black number: number of aquifer system
Groundwater
- Blue degradee: Major groundwater basin
  - high groundwater recharge (> 150 mm/a)
  - medium groundwater recharge (15-150 mm/a)
  - low groundwater recharge (< 15 mm/a)
- Green degradee: Area with complex hydrogeological structure
  - Forest green: high groundwater recharge (> 150 mm/a)
  - medium groundwater recharge (15-150 mm/a)
  - low groundwater recharge (< 15 mm/a)
- khaki: Area with local and shallow aquifers
- Red marks: Area of saline groundwater (> 5g/l TDS)
Surface Water
- Blue line: major river
- Alice blue: large saltwater lake
- Beige: continuous ice sheet
Geography
- Red dot: selected city
- Black intermittent line: country boundary
- Green line: boundary of continuous permafrost

CGMW/UNESCO (2000): Geological Map of the World
ESRI (2005): Data & Maps
USGS (2003): Global GIS
Modified by BGR (2006).

Cartographical Editing/GIS: BGR Uta Philipp, Andrea Richts and Patrick Clos

Special Edition, extracted from World-wide Hydrogeological Mapping and Assessment Programme (WHYMAP).

Printed with the financial support of UNESCO/IHP and the Federal Republic of Germany.

Printed by Graphischer Betrieb Gieseking GmbH & Co. KG, Bielefeld, Germany.

Special Edition for the 4th World Water Forum, Mexico City, March 2006.

This map is in the collection of copyrighted maps of the Geosciences and Map Library, Fine Hall (B level), Princeton University.

Call number: LF G3201.C34.2006.C6G4