Sędeń Duży [ˈsɛndɛɲ ˈduʐɨ] is a village in the administrative district of Gmina Łąck, within Płock County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 5 kilometres (3 mi) north-west of Łąck, 11 km (7 mi) south-west of Płock, and 103 km (64 mi) west of Warsaw.

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