Embalse Valle Grande is a reservoir situated in the Cañón del Atuel, approximately 30 to 38 kilometers from the city of San Rafael in the province of Mendoza, reached via Ruta Provincial 173. The reservoir covers 508 hectares and sits at an elevation of 840 meters above sea level. It forms part of a series of hydroelectric dams along the Río Atuel, and its waters are notably emerald-green in color, framed by canyon walls that can reach up to 260 meters in height — dramatic, colorful formations sculpted by wind and the river over time.

The climate is cold and dry, and warm clothing along with sunscreen is recommended regardless of season. During summer, the Río Atuel runs with higher volume and stronger rapids, making conditions more intense for river paddling. In winter, flow and speed decrease, which is considered more suitable for kayaking and calmer navigation while still allowing paddlers to appreciate the canyon scenery.

The reservoir itself supports flatwater paddling, with kayaking and catamaran tours available on the lake portion. The river section below the dam offers rafting with rapids that are challenging even for experienced paddlers, and multiple local operators run guided excursions for a range of skill levels. The distinction between the lake and river sections is worth noting when planning a trip: the reservoir provides calm paddling, while the Río Atuel downstream delivers whitewater.

Access to the area is by vehicle along Ruta Provincial 173. The dirt road in the area can be in poor condition, so paddlers should verify road conditions before traveling. Accommodation options in the Valle Grande zone include campgrounds, cabins, and hotels, along with restaurants and supply stores, making multi-day trips logistically feasible. The recommended stay is two to four days to make the most of the area.