Kierzek [ˈkʲɛʐɛk] is a village in the administrative district of Gmina Kadzidło, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 10 kilometres (6 mi) west of Kadzidło, 25 km (16 mi) north-west of Ostrołęka, and 115 km (71 mi) north of Warsaw.

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