Embalse Potrero de los Funes is a reservoir situated approximately 18–23 km northeast of the city of San Luis, in the province of San Luis, Argentina. It lies within a broad valley of the Sierras de San Luis at an elevation of roughly 953–1,000 meters above sea level. The reservoir covers a surface area of 3.6 km² (360 hectares) and reaches an average depth of 33 meters. It was formed by damming the río Potrero, which collects water from several smaller streams including the arroyo Los Molles and La Bolsa. The current dam structure dates to 1927, making the reservoir one of the oldest artificial impoundments in South America.

The water is crystal-clear, set against a backdrop of mountain ranges that rise from 900 to over 2,100 meters. A 6 km circuit around the lake offers an opportunity to explore the shoreline on foot, and the surrounding terrain includes gorges, streams, and the Salto de la Moneda waterfall, a cascade located within a forest notable for its large ferns.

Kayaking is a well-established activity on the reservoir. Guided kayak outings are available locally and typically include instruction in basic paddling techniques, water reading, and safety before launching. The calmer shoreline areas are ideal for paddling and swimming stops. Pedal boats are also available for rental. The Parque Nativo, located on the reservoir's shore, is a publicly accessible park that provides a convenient base for water-based activities, with facilities including barbecue areas and boat rentals.

The reservoir is also used for fishing, with carp and pejerrey among the species present. Several hotels, hostels, and tourist complexes line the shores, including a floating café associated with the Hotel Potrero de los Funes. Summer is the most popular season for water activities, attracting both local visitors and tourists from across the region. The mild climate of the valley makes the reservoir accessible year-round. Access to the area is via Ruta Provincial 18, which connects Potrero de los Funes to the city of San Luis.