The high plains of Monte Acuto, on the southern slopes of the Limbara range, are home to the remains of defensive fortresses and strategic outposts from early medieval times. Wounded during fierce battles and marked by the passage of time, Monte Acuto Castle sits at 500 metres in the Berchidda region and is a fine example. First documented after the XIII century, it enjoyed its most flourishing period when it was the seat of Giudicessa Adelasia di Torres and of archbishops, prelates and a variety of dignitaries. The castle was vied for first among the guidicati, and then fought over by Pisa and Genoa. It remained a vital structure until the Catalan-Aragonese conquest, after which it began to fall into disuse and declined to its current state. Perched on high, it watched over the roads travelled by convoys along the Mannu river valley, where merchandise was carried towards Terranova Port, modern-day Olbia, and connected with the Upper Gallura.