Laguna La Brava is a tectonic lake situated in the eastern part of the Balcarce Partido in Buenos Aires Province, approximately 40 kilometres northwest of Mar del Plata and 25 kilometres east of the town of Balcarce. The lake covers 420 hectares, stretches 3.5 kilometres in length and 1.2 kilometres in width, and reaches depths of 4 to 6 metres. It is classified as a rift or tectonic lake, possibly formed as a natural reservoir by dunes, and sits within the Balcarce mountain range. The water is notably dark green in colour, particularly vivid under summer sun, and the surrounding landscape — hills rising around the lagoon — gives the place a character more reminiscent of Patagonia than the typical Buenos Aires pampa.

Kayaking is actively practiced on the lagoon. Paddling routes range from short 0.4-kilometre outings to longer crossings of roughly 8 to 9 kilometres, including a full circuit of the lake. Recreational kayak courses are offered at Cabañas Del Vuulcan on the lagoon shore, run by instructors certified in Coastal Kayaking Level 3 through the American Canoe Association; no prior experience is required for participants aged 14 and up. The Club de Pesca Balcarce on the north shore and Ruca Lauquen on the east coast both have boat piers and recreational facilities, making them practical launch points. Summer mornings offer the best conditions for clear skies and vibrant water colour, with weekdays attracting fewer visitors.

Public access to the water's edge is limited. Much of the shoreline is privately held by resorts and campsites, and the main publicly accessible area is a small esplanade of roughly 50 metres reached via a gravel road off Route 226. Paddlers should identify designated public access points before arriving and be prepared for minimal on-site services; bringing food and water is advisable. The Tajamar stream serves as both the primary inflow and outflow.

Wildlife around the lagoon includes swans, ducks, coots, herons, and gulls, as well as capybaras and otters along the shores. The lake area is privately owned overall but open to the public for fishing and camping, and several campsites with facilities are available for those planning overnight stays.