Białobrzegi [bʲawɔˈbʐɛɡʲi] is a town in Poland, in Masovian Voivodeship, about 60 kilometres (37 miles) south of Warsaw. Since 1998 it has been the capital of Białobrzegi County. From 1975 to 1998, the town administratively belonged to Radom Voivodeship. Prior to 1975, it belonged to Kielce Voivodeship (1919 - 1975). According to data from December 31, 2011, the city had 10,410 inhabitants. The city is located on the border of the Białobrzegi Valley and Radom Plain, about 30 miles (48 kilometres) northwest of Radom. The river Pilica flows through the town. Białobrzegi is placed on boundary of two major Polish historical regions - Lesser Poland and Mazovia, and was not administratively tied with Mazovia and Warsaw until 1999.