Embalse Agua del Toro is a reservoir formed by an arch dam on the Río Diamante, located approximately 84–89 kilometers west of San Rafael in Mendoza Province, Argentina. The dam itself stands 118.5 meters high and was completed in 1973, with the associated hydroelectric station commissioned in 1982. At maximum normal operating level, the reservoir covers approximately 1,085 hectares with a volume of around 296 cubic hectometers, making it the second largest reservoir in Mendoza Province.

The reservoir sits within an area known as Pampa Amarilla, backed by Andean scenery including views toward the Diamante volcano. The water surface is notably green in appearance. Water levels have varied considerably over the decades, with significant fluctuations tied to snowmelt cycles, drought periods, and upstream regulation — a factor paddlers should keep in mind when planning a visit, as the usable water surface can change substantially from year to year.

A range of water sports are practiced on the reservoir, including sailing, rowing, motorboating, diving, and windsurfing. The reservoir is also well regarded as a fishing destination, particularly for pejerrey and salmonids.

Access to the reservoir is via gravel roads. The two primary routes are from Pareditas along the old Ruta 40 alignment, and from Las Salinas connecting to Ruta 144. Both roads have been improved in recent years and can accommodate small vehicles and those towing boats, though conditions can deteriorate in wet weather and caution is advised. The reservoir can also be reached via gravel roads from National Route 40 or through the Los Reyunos circuit. A higher-clearance vehicle is generally recommended. The area is best visited during daylight hours.

The reservoir is part of the Río Diamante hydroelectric system, jointly operated for power generation, flood control, and irrigation of approximately 90,000 hectares downstream. These operational priorities mean water levels are actively managed and can shift independently of natural precipitation patterns, which is a relevant consideration for paddlers planning around shoreline access or launch points.