• El Tranco is the largest reservoir in the province of Jaén, and one of the largest in Spain, with a capacity of 498 cubic hectometres and an area of 1,500 hectares.
  • In the centre of the Sierras de Cazorla, Segura y Las Villas Natural Park, it is fed mainly by the waters of the Guadalquivir.
  • Of fundamental scenic and ecological importance to the Park, El Tranco also offers active tourism in the form of water sports.
  • A small island rises from its waters, known as Bujaraiza island because it holds the remains of the castle of the same name.