Bierzwnik [ˈbjɛʐvnik] (German: Marienwalde)[1] is a village in Choszczno County, West Pomeranian Voivodeship, in north-western Poland.

It is the seat of the gmina (administrative district) called Gmina Bierzwnik.

[2] It lies approximately 24 kilometres (15 mi) south-east of Choszczno (Arnswalde) and 84 km (52 mi) south-east of the regional capital Szczecin (Stettin).

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