Lasanka [laˈsanka] 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.

[1] It lies approximately 4 kilometres (2 mi) south-west of Sejny and 110 km (68 mi) north of the regional capital Białystok.

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