lat., and follows the water-parting southward to the highest peak of the Tres Cruces mountains in 27° o' 45" S.
long., and along the water-parting around the upper basin of the Huahum to a junction with the line previously determined.
In the third and longest section, the line starts from a pillar erected in the Perez Rosales pass, near Lake Nahuel-Huapi, and follows the water-parting southward to the highest point of Mt.
two-thirds of the state, it forms a water-parting between the streams which flow W.
The rivers of the province belong to the basins of the Indian Ocean and the Java Sea respectively, the water-parting being formed by the western and eastern ends respectively of the northern and southern lines of mountain peaks.