Ostrów is a village in the administrative district of Gmina Szre sk, within M awa County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) east of Szre sk, 16 km (10 mi) south-west of M awa, and 104 km (65 mi) north-west of Warsaw. The village has a population of 100. Gmina Szre sk is a rural gmina (administrative district) in M awa County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Szre sk, which lies approximately 21 kilometres (13 mi) south-west of M awa and 107 km (66 mi) north-west of Warsaw. The gmina covers an area of 109.66 square kilometres (42.3 sq mi), and as of 2006 its total population is 4,537.