 It is spread over the Mazovian Lowland, on both sides of the Vistula river and its confluence with Narew and Bug.Forests (mainly coniferous) cover one-fifth of the region, with the large Kampinos Forest, Puszcza Biała and Puszcza Zielona.In the north Mazovia borders on the Masurian subregion of former Prussia, in the east on Podlachia, in the south on Lesser Poland and in the west on Greater Poland (subregions of Łęczyca Land, Kujawy and Dobrzyń Land).