Laguna del Diamante (Spanish for "lake of the diamond") is a lake located in the province of Mendoza, Argentina, in the San Carlos Department, some 198 km from Mendoza.

It covers a surface area of about 14.1 km2 and is one of the largest freshwater resources in the Province.

The lake was described by Antoine de Saint-Exupéry in his book Wind, Sand and Stars as quoted, "...he [Guillaumet] caught sight of a dark horizontal blot which he recognized as a lake Laguna Diamante".

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