Dordrecht, Dortse Biesbosch, Polder de Biesbosch, the polder was reclaimed from 1926, the polder has a unique structure due to the fact that the main creeks or kills, the Noorderels, the Middenels and the Kwalgat were spared to ensure natural drainage. (c) 7 July 2023 Aerophoto-Schiphol | aerial view 309976