170 



latter river and the Guapore, which is a tributary stream of 

 the Madeira, the boundaries are disputed by the Portu- 

 guese -j and it is uncertain it they ought to be extended on 

 the south beyond the Rio Colorado as far as the Rio Negro, 

 which receives the waters of the Rio del Diamante (Abeja 

 Argentina 1822,, N° 1, p. 8, and N° 2, p. 55). Amidst these 

 uncertainties, which are augmented by the partition of 

 Paraguay and the Cisplatine Province, I have calculated the 

 dimensions of the vast territory of the viceroyalty, accord- 

 ing to the limits traced on the Spanish maps before the revo- 

 lution of 1810. Those limits are, on the east, the Marco > 

 a little to the northward of the fort of Santa Teresa, at the 

 mouth of the Rio Tahym j from thence they stretch to the 

 N. N. W. by the sources of the Ibicuy and of the Juy (cut- 

 ting the Uruguay in latitude 27° 20 ') to the confluence of 

 the Parana and the Yguazu j on the north along the left 

 bank of the Parana as far as 22° 42 / south lat. ; on the 

 N. W. following the Ivineima, towards the presidency of 

 Nova Coimbra (lat. 19° 55'), founded in 1775 j on the 

 N. N. W. near Villa Bella and the isthmus which separates 

 the waters of the Aguapchy (a tributary of the Paraguay) 

 and those of the Guapore towards the junction* of the lat- 

 ter river with the Mamore, below the fort of Principe 

 (11° 54' 46" south lat ) ; on the S. W. ascending the 

 Mamore and the Maniqui, as we stated above when we 

 traced the limits of Peru and the viceroyalty of Buenos* 

 Ayres. Between the 21° 26' and 25° 54' of south lat. (be- 

 tween the Rio de Loa and Punta de Guacho'), the territory 

 of the viceroyalty reaches beyond the Cordillera of the 

 Andes, and occupies for a distance of ninety leagues the 

 coast of the South Sea. Here lies the desert of Atacama, 

 in which is situated the small port of Cobija, which might 



* P, 40. 



