The Benedictine monastery of Sant Pere de Casserres, located within the park, dates back to the 11th century and is the only monastery of its order in the Osona region.
The Sau reservoir, which flooded the former village of Sant Romà de Sau, is a prominent feature that reveals the submerged church bell tower during periods of low water.
The area is home to the 'Roc de la Mel', a notable sandstone cliff formation frequently used for rock climbing.
The park serves as a biological corridor connecting the Montseny Natural Park with the Collsacabra mountains.
The local microclimate allows for the coexistence of vegetation typically found in the Pyrenees alongside Mediterranean species.
Espai Natural de les Guilleries-Savassona is a protected mountain landscape covering over 8,300 hectares between the Collsacabra plateau and the Guilleries massif. The terrain is characterized by sandstone cliffs, deep valleys, and dense forests of holm oak, cork oak, and beech. The area is dominated by the Sau reservoir, which surrounds the Sant Pere de Casserres monastery. Geologically, it features unique rock formations created by the erosion of Eocene sandstone. It serves as a transition zone between Mediterranean and Central European vegetation types. The area is officially designated as a space of natural interest, integrating both wild mountain terrain and cultural heritage sites. It offers an extensive network of marked hiking, mountain biking, and equestrian trails. The Guilleries sector is notably rich in springs and streams flowing into the Ter river basin.
The viewpoint overlooking the Sant Pere de Casserres monastery as it sits on the peninsula surrounded by the reservoir.
Bring a high-quality physical map or GPS device as mobile signal is inconsistent in the deeper valleys.
Check water levels of the Sau reservoir before arriving if you are specifically interested in seeing the submerged church ruins.
Prioritize visiting during weekdays to avoid peak crowds from Barcelona residents on weekends.
Do not attempt to swim in the reservoir or restricted water bodies, as depth and current safety protocols are strictly enforced.
Stay strictly on marked paths to prevent erosion and protect the sensitive forest undergrowth.
