Piączyn [ˈpjɔnt͡ʂɨn] is a village in the administrative district of Gmina Staroźreby, within Płock County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 10 kilometres (6 mi) east of Staroźreby, 29 km (18 mi) east of Płock, and 75 km (47 mi) north-west of Warsaw.

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