The Sintra Mountains (Portuguese: Serra de Sintra), is a mountain range in western Portugal. Its highest point is at 529 meters (1,736 ft) near Sintra. The range covers about 16 kilometers (10 mi) from the resort town of Sintra to Cabo da Roca (Cape Roca) on the Atlantic Ocean. It was known to the Ancient World as Lunae Mons (mountain of the Moon) and was the legendary retreat of Diana the Huntress.