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Kälviä (Kelviå in Swedish) is a municipality of Finland.
It is located in the province of Western Finland and is part of the Central Ostrobothnia region. The municipality has a population of 4,475 (2003) and covers an area of 682.36 km² of which 14.68 km² is water. The population density is 6.6 inhabitants per km².
The municipality is unilingually Finnish.