Oiã, Freguesia and town in Oliveira do Bairro, Portugal.
Oiã covers an area of approximately 26.74 square kilometers within the municipality of Oliveira do Bairro, housing a population of 7,862 residents according to the 2021 census with a density of 294 inhabitants per square kilometer.
The first written references to Oiã date back over 800 years, with historical documents from 1220 establishing its significance as one of the oldest settlements in the Aveiro region of Portugal.
The freguesia maintains a vibrant associative movement encompassing sports, cultural, recreational and public interest entities that organize traditional festivals celebrating patron saints and attracting visitors from neighboring areas throughout the year.
Oiã features a railway station providing efficient transport connections, a continuously growing industrial zone, and strategic location just 5 kilometers from A1 motorway access and 18 kilometers from Aveiro city center.
Oiã holds the linguistic distinction of being the only locality in Portugal whose name consists exclusively of vowels, drawing attention from visitors and scholars interested in this remarkable toponymic characteristic.
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