Estancia La Unión is a tradicional ranch placed in Gral. Madariaga, Buenos Aires, Argentina. It was founded in 1829 by Don José María Peña -greatgrandfather of the actual owners- and had originally an extension of 15.000 hectares destinated to the sheep, cattle and horse breeding. In our days the ranch has an extension of 1.000 hectares and the primary activity is still the cattle breeding.