Cabo da Roca (Cape Roca) is a cape which forms the westernmost extent of mainland Portugal and continental Europe. It was known to the Romans as Promontorium Magnum and during the Age of Sail as the Rock of Lisbon. The 16th-century Portuguese poet Luís de Camões described Cabo da Roca as the place "where the land ends and the sea begins". The cape is located within the Sintra-Cascais Natural Park, 42 kilometres northwest of the urbanized area of Lisbon and 18 kilometres northwest of Sintra. The cliffs are 140 metres in height.