Frontera natural en la Ribera del Cala Nature · El Real de la Jara, Sierra Norte, Seville Image of El Real de la Jara, not of the place itself. The municipality, the westernmost in the Seville Sierra Norte, has in the Ribera del Cala the natural border between the provinces of Seville and Huelva. Photo: Cazafantasmas (CC BY-SA 3.0) What to see and do in El Real de la Jara