A river approximately 130 kilometers long, serving as a border between Portugal and Spain for twenty kilometers. It originates in Spain, in the Serra das Mesas mountain range, and flows into the Douro River near Barca D'Alva.

A large lagoon, fed by the waters of the Cértima River and located in the Águeda Valley, also known as Requeixo Lagoon. It is a vast and shallow area with abundant aquatic vegetation, notably bulrush, mainly used in basketry. Among the fish species found here are eel, barbel, and carp.

Oak oversized centenary. Deserves a nocturnal visit by the beautiful spectacle that offers, all lit up and with a beautiful surrounding area.