Kupnina [kupˈnina] is a village in the administrative district of Gmina Nowogród, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland.

[1] It lies approximately 8 kilometres (5 mi) north-east of Nowogród, 16 km (10 mi) north-west of Łomża, and 84 km (52 mi) west of the regional capital Białystok.

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