Berżniki [bɛrʐˈniki], (Lithuanian: Beržininkai) is a village in the administrative district of Gmina Sejny, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Lithuania. It lies approximately 7 kilometres (4 mi) south-east of Sejny and 109 km (68 mi) north of the regional capital Białystok.
The village has a population of 320.
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