Marynowo [marɨˈnɔvɔ] 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 5 kilometres (3 mi) south-west of Sejny and 110 km (68 mi) north of the regional capital Białystok.
The village has a population of 120.
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