Mondego River

The Mondego River, also known as Mondego, is the longest river entirely within Portuguese territory. It has its source in Serra da Estrela, the highest mountain range in mainland Portugal (i.e. excluding the Portuguese islands). It runs 234 kilometres (145 mi) from the Gouveia municipality, at 1,425 metres (4,675 ft) above sea level in Serra da Estrela, to its mouth in the Atlantic Ocean next to the city of Figueira da Foz.