Mazovia or Masovia is a historical region in mid-north-eastern Poland. It spans the North European Plain, roughly between Łódź and Białystok, with Warsaw being the largest city and Płock being the cap

Ostrołęka is a small city in northeastern Poland on the Narew river, about 120 km northeast of Warsaw, with a population of 51,012 and an area of 33.46 square kilometres. It is the capital of both Ost