The Sierra de Collserola, or simply Collserola, is a mountain range between the rivers Besòs and Llobregat. It is part of the Catalan Coastal Range. These mountains separate Barcelona from the Vallès plain and their tallest peak is the Tibidabo, at 512 m. Other main summits are: Turó del Puig, Puig d'Olorda, Turó de Valldaura, Turó de la Magarola, Puig d'Ossa, and Puig Madrona.