Embalse El Nihuil is a large reservoir covering approximately 9,600 hectares in the province of Mendoza, Argentina, situated at an altitude of 1,300 metres above sea level. It lies within the Cuyo region alongside the Andes mountain range and is reached via National Route 144 and Provincial Route 180 from the city of San Rafael, roughly 72 kilometres away. The reservoir's coordinates place it at approximately 35°04'S, 68°45'W.

The environment surrounding the reservoir is arid and dramatic, characterized by 200-metre-high dunes, canyons — notably the Cañón del Nihuil — and nearby salt flats. The climate is cold and dry, and the area is known for strong winds, which are a significant factor for paddlers to account for when planning a trip. These persistent winds make conditions challenging and can change the character of the water surface considerably.

Canoe and kayak paddling are popular activities on the reservoir. The same strong winds that create hazardous paddling conditions also support windsurfing and kitesurfing, so paddlers should expect to share the water with wind-sport users and motorized craft, including powerboats used for water skiing. Awareness of boat traffic is an important safety consideration.

The reservoir supports a variety of fish species, including pejerrey patagónico, Creole perch, and rainbow trout, making it a popular fishing destination. Birdwatching is also rewarding in the area, with wildlife visible to paddlers moving along the shoreline.

A recommended stay of two to three days allows visitors to explore the scale of the reservoir and the range of surrounding terrain. The combination of high altitude, strong winds, extreme temperatures, and remote arid surroundings means paddlers should come well prepared with appropriate gear and safety equipment.