This raster layer is a void-filled digital elevation model (DEM) of Africa at 30 arc-seconds resolution. Elevations is in meters referenced to the WGS84 EGM96 geoid. The primary data source of HydroSHEDS is the digital elevation model of the Shuttle Radar Topography Mission. SRTM elevation data were obtained by a specially modified radar system that flew onboard the Space Shuttle Endeavor during an 11-day mission in February of 2000. Regions of no-data (voids), specifically mountainous regions, or those over large water bodies prevented the production of reliable elevation data. The existence of no-data in the DEM causes significant problems for deriving hydrological products, which require continuous flow surfaces. Therefore, a void-filling procedure has been applied to provide a continuous DEM for HydroSHEDS. The goal of developing HydroSHEDS was to generate key data layers to support regional and global watershed analyses, hydrological modeling, and freshwater conservation planning at a quality, resolution and extent that had previously been unachievable. Users may apply HydroSHEDS for non-commercial purposes. We kindly ask users to cite HydroSHEDS in any published material produced using this data. Any modification of the original data by users must be noted. The authors of HydroSHEDS may request reprints of publications and copies of derived materials. The user shall not reproduce, convert, (re)publish, (re)distribute, (re)broadcast, (re)transmit, sell, rent, lease, sublicense, lend, assign, time-share, or transfer, in whole or in part, or provide unlicensed third parties access to the data and related materials without explicit written permission from the authors. For more details see HydroSHEDS Technical Documentation. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.