Zakroczym [zaˈkrɔt͡ʂɨm] is a small town in the Masovian Voivodeship, Poland. It is located at around (52°26′16″N20°36′43″E). The Vistula River flows through the town. Zakroczym has a long and rich history: in the Kingdom of Poland and the Polish-Lithuanian Commonwealth, it was the capital of an administrative unit (ziemia), part of Mazovian Voivodeship. Also, Zakroczym was a royal town of the Crown of the Kingdom of Poland.