Kostrogaj [kɔsˈtrɔɡai̯] is a village in the administrative district of Gmina Radzanowo, within Płock County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 11 kilometres (7 mi) west of Radzanowo, 4 km (2 mi) north-east of Płock, and 94 km (58 mi) north-west of Warsaw.

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