Olszewka [ɔlˈʂɛfka] is a village in the administrative district of Gmina Lelis, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 9 kilometres (6 mi) south-west of Lelis, 11 km (7 mi) north-west of Ostrołęka, and 107 km (66 mi) north of Warsaw.

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