Serra da Estrela Natural Park is situated in the largest mountain range in Portugal - the Serra da Estrela, and is the source of the rivers Mondego, Zêzere, and Alva. The park is the largest natural conservation area in Portugal and occupies about 1,000 km². More than half of its area is located above an altitude of 700 m. At 1,993 m it contains the highest peak in Continental Portugal and a ski resort.