The border to the north of the lake follows the ridgeline of the last major expression of the eastern Andes.

The 12,156 foot (3,706 meter) high Monte San Lorenzo has a small stream named Oro River, originating on its north flank that flows generally northeastward into Lake Pueyrredón.

A bathymetric survey of the lake was carried out between December 1996 and February 1997, using an Echo Sounder with GPS navigation.

The results showed that the central basin of the lake reaches a depth of 460m (1,509 ft).

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