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Sampling sites. The Vistula: 1 Kraków, 2 Nida, 3 Dunajec, 4 Sandomierz, 5 San, 6 Wieprz, 7 Dęblin, 8 Pilica, 9 Warszawa, 10 Bug & Narew, 11 Bug, 12 Narew, 13 Bzura, 14 Drwęca, 15 Toruń, 16 Brda, 17 Grudziądz, 18 Leniwka, 19 Nogat. The Odra: 1 Chałupki, 2 Mała Panew, 3 Nysa Kłodzka, 4 Bystrzyca, 5 Barycz, 6 Głogów, 7 Bóbr, 8 Nysa Łużycka, 9 Słubice, 10 Warta, 11 Noteć, 12 Gozdowice, 13 Widuchowa. The Pomeranian Rivers: 1 Rega, 2 Parsęta, 3 Słupia
