Osowiec-Twierdza is a village in the administrative district of Gmina Goniądz, in Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 5 kilometres south of Goniądz, 11 km north-west of Mońki, and 51 km north-west of the regional capital Białystok. Osowiec-Twierdza is home to the Biebrza National Park.
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Address 19-110, Poland
Coordinates 53°28'25.504" N 22°39'49.005" E