National Park the Biesbosch, Gat van den Kleinen Hil, and the Catharinapolder. The Biesbosch is a nature reserve consisting of creeks and willow tidal forests and has freshwater tides. The Biesbosch was created in the years following the Sint-Elisabeth flood of 1421. (c) 7 July 2023 Aerophoto-Schiphol | aerial view 309986