Area around the El Salt site
Topographic data: NASA JPL (2013). "NASA Shuttle Radar Topography Mission Global 1 arc second". NASA AppEEARS. NASA EOSDIS Land Processes DAAC. DOI:10.5067/measures/srtm/srtmgl1.003.
Highways, Rivers, Buildings, and other point of interest data: OpenStreetMap
AntiCompositeNumber, OpenStreetMap contributors