Kostowiec [kɔsˈtɔvjɛt͡s] is a village in the administrative district of Gmina Nadarzyn, within Pruszków County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 5 kilometres (3 mi) south-west of Nadarzyn, 12 km (7 mi) south of Pruszków, and 24 km (15 mi) south-west of Warsaw.

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