LB 37

Take a look at the Terrain view of the Sat map "Gaborone" here:

http://www.nationsonline.org/oneworld/map/google_map_Gaborone.htm

Navigate til you can see "Mashupa" in the lower left of the map, and then check out the Satellite view, where the river you are looking at is the Notwane River.  This is probably what the cook means by "Notobane River."