The Sintra-Cascais Natural Park is a park on the Portuguese Riviera, one of the 13 Natural Parks of Portugal. While only established in 1994 as a Natural Park by the Portuguese Government, it has been protected since 1981. Its area is approximately 145 km². The park includes the Serra de Sintra Mountain Range but extends all the way to the coast and Cabo da Roca, continental Europe's westernmost point. It contains the Castle of the Moors. Located within 25 km of Lisbon, the Sintra-Cascais Natural Park is a popular tourism area, with many different individual historical and natural sites and attractions. Sintra and Cascais are towns and municipalities in the Lisbon / Estoril Coast.