Masovian Voivodeship

The Masovian Voivodeship, also known as the Mazovia Province, is a voivodeship in east-central Poland, with its capital located in the city of Warsaw, which also serves as the capital of the country. The voivodeship has an area of 35,579 square kilometres and, as of 2019, a population of 5,411,446, making it the largest and most populated voivodeship of Poland. Its principal cities are Warsaw in the centre of the Warsaw metropolitan area, Radom in the south, Płock in the west, Siedlce in the east, and Ostrołęka in the north.

The province was created on 1 January 1999, out of the former voivodeships of Warsaw, Płock, Ciechanów, Ostrołęka, Siedlce and Radom, pursuant to the Polish local government reforms adopted in 1998. The province's name recalls the traditional name of the region, Mazovia, with which it is roughly coterminous.