Laguna Brava is the wilder excursion from Villa Unión, a long climb into high, dry Andean country where the air thins and the horizon opens. The lake sits above 4,000 metres and is known for flamingos, salt-white edges, and a feeling of real remoteness.
This is not a casual picnic stop. Go with a reliable local operator or a properly prepared vehicle, and take the altitude seriously.