The castle of Mur is located in the mountain range of El Montsec in the Catalan Pre-Pyrenees. During the 10th and 11th centuries, Mur is the centre of a territory situated at the first line of the border with the Islam, between al-Andalus and the Catalan counties. This situation compels to design some measures of protection like a network of castles and watchtowers with a visual communication between them. The landscape of this zone is covered by forest and pastures, more tan fields that we can find down the valley and in the sunny slopes. The agriculture is based on cereals, vine and olive trees, but also irrigated crops that are related to a hydraulic infrastructure and some fruit trees. The remains that can be identified on the spot and the documents confirm it.