EIVEES OF AEGENTINA. 



371 



nearhr dr)% except in the lower reaches, which have become brackish. It takes 

 its name from the reddish colour of the stream, which throughout its lower course 

 is obstructed at intervals by banks of a white clay, like those of the Pilcomayo, 

 which it so greatly resembles in its general régime. Including the windings it 



Fi^'. 150.— Tees Bocas in 18G0. 

 Scale 1 : 500.000 



58 40 



We st op ore enw ch 



58 -0 



12 Miles. 



has a total length of over 1,300 miles, of which nearly 850 are navigable for six 

 months in the year. 



The Rio del Juramento. 



The Eio del Juramento has its farthest sources in the Nevados of Cachi, west 

 of the Salta uplands. Forcing its way in abrupt windings through the barrier of 

 the sierras, it is known by various names along its irregular upper course, first 

 Guachipas, then Rio del Pasnje at the point where it is crossed by the highway 



