The reserve emerged spontaneously when engineers failed to drain a section of the polder, resulting in the accidental creation of a marshland.
It is one of the few places in Western Europe where large-scale 'wild' grazing occurs without human intervention.
The white-tailed eagle, once extinct in the Netherlands, has successfully re-colonized and bred in the area.
During harsh winters, the population of large grazers undergoes natural culling, a phenomenon that has sparked significant national public debate on animal welfare.
The marshland acts as a natural water filtration system for the surrounding Flevoland polder landscape.
Oostvaardersplassen is a massive 5,600-hectare marshland nature reserve created following the reclamation of the Flevoland polder in 1968. It functions as a unique ecological experiment in rewilding, featuring large populations of Heck cattle, Konik horses, and red deer that roam freely within fenced areas. The landscape consists of expansive shallow lakes, reed beds, and grasslands, serving as a critical migratory stopover for various bird species, including the rare white-tailed eagle. Public access is strictly controlled to preserve the undisturbed habitat, with visitors confined to designated trails, cycle paths, and observation hides. The reserve is managed by Staatsbosbeheer, focusing on natural grazing processes without human intervention in the animals' life cycles. It is recognized as a Natura 2000 protected area due to its international significance for wetland ecology.
The Zeearend observation hide, which provides elevated views over the marshes and the best chance to spot birds of prey.
Bring high-quality binoculars, as the expansive nature of the terrain keeps wildlife at significant distances.
Visit the 'Oostvaardersplassen Visitor Center' first to view maps showing which trails are currently open or closed due to seasonal wildlife nesting.
Check local weather forecasts beforehand, as the flat, open polder terrain is highly exposed to wind with very little natural shelter.
Do not attempt to approach or feed the Konik horses or cattle, as they are wild animals, not domesticated livestock.
Some trails are seasonally closed to the public between spring and early summer to protect ground-nesting birds.
Stay strictly on marked paths to avoid disturbing wildlife and preserve the fragile ecosystem.
