Lago Salto Grande is a large reservoir formed by the Salto Grande hydroelectric dam on the Río Uruguay, which marks the border between Argentina and Uruguay. The Argentine western shore falls within Entre Ríos Province, near the city of Concordia. The reservoir stretches approximately 144 km in length and roughly 9 km in width, covering a surface area of 783 km², sitting at about 35 meters above sea level. Its scale makes it one of the more substantial flatwater paddling environments in the region.

The reservoir is an established recreational destination. Stand-up paddleboarding and kayaking are among the water activities available, and the surrounding area has been developed as a public park with harbors, camping sites, and other visitor facilities. The proximity to Concordia means the lake can see considerable recreational traffic, particularly during summer months when beach and river activities are most popular. Sport fishing is also popular here, with dorado, surubí, pacú, and boga among the target species, so paddlers should expect to share the water with fishing boats.

One environmental consideration worth noting is ongoing siltation. The reservoir's catchment area covers approximately 224,000 km², much of it flat agricultural plain, and accelerated soil erosion during the rainy season contributes to sediment loading in the water. Paddlers should be aware of this as a factor affecting water clarity.

Concordia is accessible via National Routes 12 and 14, and the city has its own airport, making logistics relatively straightforward for those traveling from elsewhere in Argentina. Entre Ríos is a year-round destination, with summer drawing visitors for water-based activities and the cooler months offering a quieter experience.