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Aveiro ([aˈvɐjɾu] is a city and a municipality in Portugal. In 2021, the population was 80,880, in an area of 197.58 square kilometres (76.29 sq mi) it is the second most populous city in the Centro Region of Portugal (after Coimbra). Along with the neighbouring city of Ílhavo, Aveiro is part of an urban agglomeration that includes 120,000 inhabitants, making it one of the most important populated regions by density in the North Region, and primary centre of the Intermunicipal Community of Aveiro and Baixo Vouga. For a long period Aveiro was an important economic link in the production of salt and commercial shipping. It was a centre of salt exploration by the Romans and trade centre through the Middle Ages, registered since 26 January 959 from the testament of Countess Mumadona Dias to the cenóbio of Guimarães.