210 



AFRICA 



is to be compared with similar belts round the Australian 

 desert, especially on the northern side, and with the 

 southern margins of the Afghan and Indian deserts. 

 Such regions are naturally passage ways: the number 

 of wells and water-holes increases as the desert is left 

 behind; yet cultivation remains localized in a very 



FIG. 80. Open Brush Nigeria. 



few and small areas. The tending of sheep, camels, 

 and half-wild cattle is the main occupation of the 

 nomad populations. 



Sudanese Savana. The savana is one of the most 

 widespread landscapes of Africa: it extends in an 

 uninterrupted belt around the great forest region, from 

 Senegal to the Egyptian Sudan, thence over the region 



