Siurana reservoir, in an area of outstanding natural beauty, is surrounded by the Montsant and Prades mountain ranges. It is fed by the Siurana river which is one of the main affluents of the Ebro river.
This little corner of the Montsant mountain range is one of the most famous of the Natural Park. It is to be found in the heart of the mountain range and can be reached from the village of La Morera de Montsant or by the Grau de Salfores or Grau de la Grallera going towards PIló dels Senyalets. These "Graus" are gullies which allow visitors to gain access to the mountain top area. These routes converge at the Pi del Cugat where visitors must take a little path which leads down to the hollow.