The Plaat van de Vliet is a former sandbank that became dry after the damming of the Krammer-Volkerak in 1987 and is now a unique nature area. It is home to rare plant species typical of moist, calcareous dunes, including Parnassia, wintercress, thousand-guilder flower, and various orchids. Grazing management is carefully implemented to prevent the encroachment of shrubs on these rare plants.
The surrounding waters are rich in various bird species, including grebes and ducks such as the middle spotted woodpecker and the goldeneye. Birdwatchers can enjoy the fauna from observation towers and hides, making this area particularly valuable for nature and bird enthusiasts. The combination of rare plants and a diverse bird population makes the Plaat van de Vliet a significant location for nature lovers.
To ensure natural biodiversity, grazing is carried out by koniks, red geese, and wisents. These animals help prevent elder and sea buckthorn from overtaking the rare plants. Additionally, measures have been taken to combat drifting sand, such as planting beach grass, leading to the formation of low drifting dunes.