Embalse Paso de las Carretas is a reservoir located in Departamento Coronel Pringles, approximately 50–55 kilometers from the city of San Luis and about 70 kilometers from Villa Mercedes via the Autopista Serranías Puntanas. The reservoir was constructed in 1983 with the primary purposes of compensating the Dique La Florida, attenuating flooding along the middle course of the Río Quinto, and securing irrigation for a broad area around Villa Mercedes. The reservoir covers a surface area of 750 hectares, holds a capacity of 74 cubic hectometers, and drains a watershed of 1,800 square kilometers.

Kayak paddling is an established activity on the reservoir, with organized kayak fishing outings taking place on the water. Paddlers should be aware that wind can develop and pick up quickly, creating cross-winds that agitate the surface and can result in getting wet if proper paddleware is not worn. Water levels can vary considerably depending on rainfall, and at times the reservoir has been notably below capacity, exposing shoreline areas that are normally submerged.

A fishing and boat launch camping area operates on site, offering cabins and basic amenities. A boat ramp is also present. Regarding fishing regulations, a restricted fishing zone requires anglers to remain at least 200 meters from the shore and dam wall; Dique Paso de las Carretas is among the diques where fishing is permitted under this arrangement. Pejerrey and carpa are the fish species present in the reservoir.

The surrounding landscape is dominated by caldén woodland, accompanied by native species including tala, chañar, tusca, espinillo, tintitaco, and piquillín. The area has historical significance as a former staging post and river crossing point on the old messenger route between Chile and Río de la Plata. Access is straightforward via paved provincial routes and highways, making the reservoir a practical destination for weekend trips from San Luis or Villa Mercedes.