Prosienica [prɔɕɛˈnit͡sa] is a village in the administrative district of Gmina Ostrów Mazowiecka, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland.^[1] It lies approximately 13 kilometres (8 mi) north-east of Ostrów Mazowiecka and 102 km (63 mi) north-east of Warsaw.