Aveiro (ävāˈrō) [key], town (1991 pop. 35,246), capital of Aveiro dist., NW Portugal, on the lagoon of Aveiro and at the mouth of the Vouga River, in Beira Litoral. Intersected by numerous canals, one of which connects with the Atlantic, the town is a fishing port that produces salt, wine, and lumber. João Alfonso, one of the discoverers of the Newfoundland fisheries, was born there. A convent (now a museum) contains the tomb of the daughter of Alfonso V, St. Joana.