3 SI I. Bowman — Physiography of the Central Andes. 



From Lake Titicaca the same feature of a plane surface trun- 

 cating complex structure may be observed. Fig. 19 illustrates 

 the topographic features displayed north of the lake (west of the 

 residuals). A similar physiographic development was observed 



Fig. 17. 



Fig. 17. View of Illimani and plateau (left) looking northwest from Araca. 



Fig. 18. 



Fig. 18. The alti-plano (high plateau) of Bolivia looking east from Viachi. 

 The Cordillera Eeal in the background. 



