Map 1. The political geography of West Africa
Source: Baseline Data: ESRI. 1993. Digital chart of the world. Environmental Systems Research Institute, Redlands, CA.
Map 2. Ecological zones of West Africa
Source: Adapted from Geerling (1982) and White (1983) as used in de Bie (1991).
Map 3. Hydrographic map of West Africa with major watersheds, lakes, and floodplains
Source: Baseline Data: ESRI. 1993. Digital chart of the world. Environmental Systems Research Institute, Redlands, CA.
Wetlands Data: Olson, D., et al. 2001, in press. Terrestrial ecoregions of the world: A new map of life on Earth. BIOSCIENCE.