Ruukki
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Ruukki is a municipality of Finland.
It is located in the province of Oulu and is part of the Northern Ostrobothnia region. The municipality has a population of 4,547 (2003) and covers an area of 779.89 kmē of which 6.34 kmē is water. The population density is 5.9 inhabitants per kmē.
The municipality is unilingually Finnish.