Mondego River

The Rio Mondego () or Mondego River 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. except the Portuguese islands). It runs from the Gouveia municipality, at above sea level in Serra da Estrela, to its mouth in the Atlantic Ocean next to the city of Figueira da Foz.
Its etymology is believed to be a pre-Roman, Hispano-Celtic voice "Munda or Monda" (*mundikos/*-moundikos < lat. *mundicus, -a), Latinised into "Mundicus < Mondæcus" until evolving into the present name.
It flows through the districts of Guarda, Viseu and Coimbra, all in Centro Region. It flows near the towns of Celorico da Beira, Fornos de Algodres, Nelas, Tabua, Carregal do Sal, Mortagua, Montemor-o-Velho and cities of Seia, Gouveia, Guarda, Oliveira do Hospital, Mangualde, Santa Comba Dao, before crossing the town of Penacova, is narrow, then widens by the city of Coimbra (with the University and the major urban area in Baixo Mondego), and the Montemor-o-Velho municipality (known for its castle and rice fields), before reaching the Atlantic at the city of Figueira da Foz.
There are 2 dams along the Mondego: Aguieira dam and Raiva dam.
Tributaries.
One of its tributaries is the Rio Dão, which gives its name to the Dão DOC wine region. Another is the River Alva, which enters the Mondego just before Penacova.
The Ceira River enters the Mondego just south of Coimbra along NH 17.