The Kaduna River Basin_OSM. Based up on US military map NC32
<a href="//commons.wikimedia.org/wiki/User:Hans_Braxmeier" title="User:Hans Braxmeier">Hans Braxmeier</a> &amp; <a href="//commons.wikimedia.org/wiki/User:Peter_in_s" title="User:Peter in s">Peter in s</a>, Location map:<a href="//commons.wikimedia.org/wiki/User:Sting" title="User:Sting">Sting</a>
CC BY-SA 3.0
<a rel="nofollow" class="external free" href="https://maps-for-free.com/">https://maps-for-free.com/</a>, <a rel="nofollow" class="external free" href="http://legacy.lib.utexas.edu/maps/ams/africa_1m/">http://legacy.lib.utexas.edu/maps/ams/africa_1m/</a>, <a rel="nofollow" class="external text" href="https://esdac.jrc.ec.europa.eu/ESDB_Archive/EuDASM/Africa/lists/cng.htm/">EuDASM – The Soil Maps of Africa</a>, Location map:<a href="//commons.wikimedia.org/wiki/File:Africa_location_map.svg" title="File:Africa location map.svg">File:Africa location map.svg</a>