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The Viana do Castelo District (Portuguese: Distrito de Viana do Castelo[viˈɐnɐ ðu kɐʃˈtɛlu]) is a district located in the northwest of Portugal, bordered on the north by Spain (Galicia) and on the south by Braga District. It has an area of 2,255 km (871 sq mi) and a population of 252,011 (2006), for a density of 111.8 inhabitants/km. The district capital is the city of Viana do Castelo.