Rio Mondego, Portugal

The longest river to run it's course entirely in the boundaries of Portugal is the River Mondego (Rio Mondego). The river rises in the Serra de Estrela mountains (Portugal's highest mountain range) at Gouveia.

The Rio Mondego then runs for 234 kilometres to the Atlantic Ocean at Figueira da Foz. The waters of the the Rio Mondego only flow through the central Portugal region, passing through the districts of Guarda, Viseu and Coimbra.