The Aveiro lagoon (Ria de Aveiro) is a lagoon in Portugal. It is located on the Atlantic coast of Portugal, south of the municipality of Espinho and north of Mira (to the north of the Cape Mondego). Its average area covers approximately 75 km². It is named after the city of Aveiro, which is the chief urban centre located near to the lagoon. Other urban centres near the Ria de Aveiro are Ílhavo, Gafanha da Nazaré, Estarreja, Ovar and Esmoriz. Some beaches nearby include those of Barra, Costa Nova, Torreira, Vagueira, Furadouro, Cortegaça and Praia de Mira.