El Yeso is a reservoir located in the Andes, in the Santiago Metropolitan Region, Chile.

El Yeso reservoir, along with the nearby Laguna Negra, is a major source of drinking water for Santiago.

Less than 2 kilometers drive, is "Refugios del Yeso", a shelter built in the 50s to house workers during the construction of the same reservoir.

In the Beagle Conflict, it was used by the Chilean Army, given its strategic value (it protects the source of drinking water in the capital, and at the same time can defend the capital against the Argentine advance, artillery being necessary).

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