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Central Ostrobothnia has an area of 6,462.93 km, of which 5,019.98 km² is land area.[4] Central Ostrobothnia, including the sea areas, is the smallest province in mainland Finland in terms of population and total area, and the second smallest province in Finland afterÅland. However, if you count the land area alone,Kymenlaakso is smaller than Central Ostrobothnia.