The Cuarto River (, 'Fourth River'), also known as Saladillo is a river of Argentina which crosses the southern part of the Province of Córdoba, and merges with the Tercero River to form the Carcarañá River (a tributary of the Paraná River via the Coronda River).
The Cuarto River, also referred to as Saladillo, is a watercourse in Argentina that traverses the southern region of Córdoba Province and joins the Tercero River to create the Carcarañá River, which ultimately flows into the Paraná River through the Coronda River.