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Posio is a municipality of Finland.
It is located in the province of Lapland. The municipality has a population of 4,526 and covers an area of 3,541.45 km² of which 490.46 km² is water. The population density is 1.5 inhabitants per km².
Pello lies just on the Swedish border and it's neighbours on the Swedish side are the municipalities of Pajala and Övertorneå.
The municipality is unilingually Finnish.