http://stat.gov.pl/download/gfx/portalinformacyjny/en/defaultaktualnosci/3328/2/17/1/statistical_yearbook_of_the_republic_of_poland_2017.pdf Statistical Yearbook of the Republic of Poland 2017], Statistics Poland, p. 85-86 The Warta has a basin area of 54529 sqkm and it is navigable from Kostrzyn nad Odrą to Konin, approximately half of its length. [