WORKING GROUP 3 
REYNDERS 
173 
0 1 2 3km 
1 i 1 1 
Lower terraces along the rivers Digul, Iwur and Irin. 
Higher terraces along the same rivers. 
Southern slopes of the mountains. 
Northern slopes. 
Relics of a peneplain. Fig. 2. Sketch of an analysis of an aerial 
photograph of the Katem region 
at random. In most cases, tribes or clans have a limited area which belongs 
to their sphere of influence and in which they have gardens. In many cases, 
after some years the gardens will be planted again on the sites previously 
occupied. Thus the subject is restricted to those regions in which there is a 
rotation period. 
In the investigations concerned it is of little importance whether the people 
live in permanent villages or in huts in their gardens during a shorter or 
longer period.