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Photograph by O. F. Cook 



THE URUBAMBA RIVER OPPOSITE OLLAXTAYTAMBO 



An ancient retaining wall still protects a bank of terraces along the base of the steep 

 southern slope of the valley. The terraces are overgrown with tara trees (Casalpinia pccti- 

 nata), pinco pinco (Ephedra), chuchao (Fourcroya), and several species of cacti. 



512 



