Classified as a Natural Monument since October 2007, the Cabo Mondego enjoys great scientific value, pedagogical and didactic-beyond its geomorphological interest and landscape quality-in particular due to Jurassic outcrops and footprints of theropods Oxfordiana dinosaurs era. It is also part of the Natura 2000 Network.
The longest river that rises and flows into the national territory (232 km) meets the sea in the city of Figueira da Foz, a fishing port and also a place for beaches, casino and tourism. The final section of the Mondego River runs between rice paddies, to finally meet the Atlantic Ocean. The river is "defended" on the right bank by the Santa Catarina Fort.
Surrounded by the Pinhal de Quiaios and green fields, Lagoa da Vela has an elongated shape and runs parallel to the sea, about five kilometers away. It is the largest lagoon in Bom Sucesso, two kilometers long and 300 meters wide. Its depth, about five meters, makes it little vegetated. It has an abundant aquatic fauna and is connected to the Foja river through a stream.
The Mondego river has its spring on the Estrela mountain, municipality of Gouveia, at an altitude of 1425 metres. Between the spring and the mouth, the Mondego flows along around 220 kilometres. Its banks, between Coimbra and Figueira da Foz, are the most fertile lands in Portugal.
Located near Quiaios, the lagoon is roundish, with an approximate diametre of 600 metres, and it is surrounded by a lovely tree area. It has little depth and that explain its dense vegetation, typical of swamp areas. In this place, a havem for aquatic birds, there are bird observatories and a Centre of Environmental Education.