The Ria de Aveiro is one of the most important and beautiful hydrographic features of the Portuguese coast. It extends for about 45 kilometers, parallel to the sea, where the Vouga, Antuã and Boco rivers flow. With a very diverse aquatic fauna, it is also a privileged place for water sports. It is the main natural attraction of the city of Aveiro.

In Baixo Vouga, between Ovar and the village of São Jacinto and covering the Municipality of Aveiro in the coastal area located between the Atlantic Ocean and the Ria de Aveiro, this extensive dune cord is located. The Nature Reserve includes, in addition to fixed and mobile dunes, a sandy beach and a forest area (Mata de São Jacinto). Once a suitable place for sardine fishing (in the 19th century), the 666 hectares of the Nature Reserve are today an important fauna and flora heritage. In terms of flora, the dunes constitute the natural habitat for numerous species , to …

This river has its spring at an altitude of about 860 metres, on the Lapa mountain, and then forms several channels and hence forms the Aveiro tidal stream. It is 148 kilometres long and its major tributaries are the Caima, Mau and Sul rivers, on the right bank, and the Águeda river, on the left bank.