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1. North America: River Network, 15s resolution, 2009

2009. World Wildlife Fund. This river network (stream lines) map for North America is derived from the flow direction map for North America. The flow accumulation map for Nor... Geological Survey (U.S.).

2. North America: River Network, 30s resolution, 2009

2009. World Wildlife Fund. This river network (stream lines) map for North America is derived from the flow direction map for North America. The flow accumulation map for Nor... Geological Survey (U.S.).

3. Australasia: River Network, 30s resolution, 2008

2008. World Wildlife Fund. This river network (stream lines) map for Australasia is derived from the flow direction map for Australasia. The flow accumulation map for Austral... Geological Survey (U.S.).

4. Europe: River Network, 15s resolution, 2008

2008. World Wildlife Fund. This river network (stream lines) map for Europe is derived from the flow direction map for Europe. The flow accumulation map for Europe is used fo... Geological Survey (U.S.).

5. Europe: River Network, 30s resolution, 2008

2008. World Wildlife Fund. This river network (stream lines) map for Europe is derived from the flow direction map for Europe. The flow accumulation map for Europe is used fo... Geological Survey (U.S.).

6. World Wildlife Fund Terrestrial Ecoregions, 2008

2008. World Wildlife Fund and ESRI. World Wildlife Fund Terrestrial Ecoregions is a polygon theme representing global terrestrial ecoregions. Ecoregions are defined as relatively larg... ESRI.

7. Africa: River Network, 15s resolution, 2007

2007. World Wildlife Fund. This river network (stream lines) map for Africa is derived from the flow direction map for Africa. The flow accumulation map for Africa is used fo... Geological Survey (U.S.).

8. Africa: River Network, 30s resolution, 2007

2007. World Wildlife Fund. This river network (stream lines) map for Africa is derived from the flow direction map for Africa. The flow accumulation map for Africa is used fo... Geological Survey (U.S.).

9. Africa: Void-filled digital elevation model, 15s resolution, 2007

2007. World Wildlife Fund. This raster layer is a void-filled digital elevation model (DEM) of Africa at 15 arc-seconds resolution. Elevation is expressed in meters and refer... U.S. Geological Survey.

10. Asia: River Network, 15s resolution, 2007

2007. World Wildlife Fund. This river network (stream lines) map for Asia is derived from the flow direction map for Asia. The flow accumulation map for Asia is used for sele... Geological Survey (U.S.).