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Siennica [ɕenˈnit͡sa] is a village in Mińsk County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Siennica. It lies approximately 12 kilometres (7 mi) south of Mińsk Mazowiecki and 45 km (28 mi) east of Warsaw. The village has a population of 2,600.