Mazovian Voivodeship or Mazovia Province[4] (Polish: województwo mazowieckie [vɔjɛˈvut͡stfɔ mazɔˈvʲɛtskʲɛ]) is the largest and most populous of the 16 Polish provinces, or voivodeships, created in 1999. It occupies 35,579 square kilometres (13,737 sq mi) of east-central Poland, and has 5,411,446 inhabitants.[1] Its principal cities are Warsaw (1.783 million) in the centre of the Warsaw metropolitan area, Radom (212,230) in the south, Płock (119,709) in the west, Siedlce (77,990) in the east, and Ostrołęka (52,071) in the north. The capital of the voivodeship is the national capital, Warsaw.
https://en.wikipedia.org/wiki/Masovian_Voivodeship