Ostaszewo Wielkie [ɔstaˈʂɛvɔ ˈvjɛlkʲɛ] is a village in the administrative district of Gmina Gzy, within Pułtusk County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 20 kilometres (12 mi) west of Pułtusk and 61 km (38 mi) north of Warsaw.

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