Ceira River

It is a lefthand tributary of the Mondego River,[1] which it enters from the south, just upstream of the city of Coimbra.

The Ceira arises in the Covilhã Municipality and flows basically southwest through Pampilhosa da Serra Municipality until it enters Góis Municipality and flows west past its villages of Soito, Colmeal, Sobral, Candosa, Capelo, Sandinha, and Cabreira to Cortecega where it turns north past the villages of Carcavelos, Góis, Nogueiro, Várzea Pequena, and Vila Nova do Ceira.

At Juncal, Góis Municipality, where it is joined from the left (south) by the Rio Sótão, the river again turns southwest towards Serpins after which it heads west past Casal de Ermio.

The river continues northwest past the villages of Alçaperna and Pomar dos Braços, and just before the village of S. Frutuoso it turns west for about 8 kilometres (5 mi), flowing past S. Frutuoso, Tapada, and the village of Ceira to where the Rio Corvo (Rio Dueça) joins it from the left (south).

In addition the reservoir is fed by water from the Castanheira Dam on the Arganil, via a 3,257-metre (10,686 ft) tunnel through the mountain.