Kostrzewy [kɔsˈtʂɛvɨ] is a village in the administrative district of Gmina Jeziorany, within Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland.

[1] It lies approximately 3 kilometres (2 mi) south-east of Jeziorany and 26 km (16 mi) north-east of the regional capital Olsztyn.

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