Best natural monuments in Gruitroderbos are found within the Duinengordel, an integral part of the Hoge Kempen National Park. The area is characterized by its unique dune landscape, which includes the Oudsberg, the highest and largest open shifting dune in Flanders. This region features a diverse ecosystem of forests, heathlands, and fens, supporting a variety of flora and fauna. These natural features offer panoramic views and geological significance, making the Gruitroderbos a notable destination for nature exploration.
Last updated: June 30, 2026
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Popular around Gruitroderbos
Beautiful sand dunes with heather, relatively small but well worth it. A highlight of our walk.
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A brick chapel in honor of the Virgin Mary
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The ideal time to enjoy beautiful colours is certainly the month of September when the heathers are in bloom.
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Very nicely situated on an elevated spot.
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Beautiful trails, many views
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Beautiful paths, given the sensitive area do not go under the fence
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The heathland on the Oudsbergduin is one of the most impressive, yet also most fragile, nature reserves in the Hoge Kempen National Park. This unique dune area, located between Oudsbergen (Opglabbeek) and Gruitrode, is no ordinary heathland: here you walk across a rare inland dune landscape that formed after the last ice age and is today one of the largest drifting sand complexes in Flanders. 🌬️ Landscape shaped by wind and time The Oudsberg formed thousands of years ago when meltwater and strong winds pushed sand from dried-up riverbeds into high dunes. Centuries of grazing and deforestation left the sand partially exposed, resulting in a dynamic landscape of: • undulating sand plains • vast purple heathlands • juniper bushes and sparse grasslands • pine forests on the edges The result is a remarkable panorama that is constantly changing under the influence of wind, seasons, and management.
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Oudsberg, along with Solterheide and Donderslag, is part of a long dune belt. The area promotes itself as the "Dune Belt." The dune belt is a 3,000-hectare, diverse, and extensive heath and forest landscape.
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The Oudsberg Sand Dune is the highest and largest open shifting dune in Flanders, rising 85 meters above sea level. It offers breathtaking panoramic views of heathlands, forests, and grasslands, and is home to a unique ecosystem with diverse flora and fauna, including rare species like the red-backed shrike and smooth snake. Its geological origins date back to the last Ice Age, making it a site of significant natural and scientific interest.
Yes, beyond the Oudsberg, you can visit the Our Lady of the Woods Shrine (Mariaberg), which is another land dune offering peaceful resting spots and views after a short climb. The area also features various fens, such as Ruiterskuilen and Turfven, which are vital 'oases' in the sandy landscape, supporting unique plant and animal life.
From the summit of the Oudsberg Sand Dune, you can enjoy expansive panoramic views of the surrounding diverse landscape, including vast heathlands, dense forests, and butterfly-rich grasslands. Other viewpoints, like those found at Our Lady of the Woods Shrine (Mariaberg), also provide serene vistas of the natural surroundings.
Yes, several areas are suitable for families. The Sand dune in Nationaal Park Hoge Kempen is noted as family-friendly, offering a unique experience of walking through sand hills. The area around the Highest dune in Flanders is also considered family-friendly and well worth a visit for its beautiful sand dunes and heather.
The diverse ecosystem around the Oudsberg and the fens supports a rich variety of wildlife. You might spot rare bird species like the red-backed shrike and European nightjar, insects such as the beautiful demoiselle and wood cricket, and even amphibians like the fire salamander. Birds of prey, including buzzards and goshawks, are also common in the area. The fens, like Turfven, are known for little grebes and moor frogs.
The impressive dune landscape, including the Oudsberg, was formed approximately 12,000 years ago during the last phase of the Ice Age. Sand drifts created deep depressions where fens later formed, and high sand deposits rose above the landscape as dune ridges. The current landscape was further shaped by sand drift caused by overgrazing in the Middle Ages.
The Gruitroderbos area offers a range of outdoor activities. You can find numerous hiking trails, including routes specifically around the Oudsberg Sand Dune. For cycling enthusiasts, there are options for both road cycling and gravel biking. Explore more routes on the hiking guide for Gruitroderbos.
Yes, the Oudsberg Sand Dune is a popular hiking destination with several well-marked trails. These range from 2 km to 14 km, catering to various fitness levels. For example, you can find routes like the 'Oudsberg Sand Dune – Oudsberg Dune loop' which is an easy 3.2 km hike. More hiking options are available in the hiking guide for Gruitroderbos.
The Gruitroderbos is beautiful year-round, but spring and autumn offer particularly pleasant conditions for exploring. In spring, the fens come alive with unique flora and fauna, such as moor frogs turning bright blue. Autumn brings vibrant colors to the forests and heathlands. Summer is also popular, but be prepared for warmer temperatures, especially on the exposed dunes.
Specific parking information for the natural monuments is usually available at the entry points to the Duinengordel or Hoge Kempen National Park. For instance, if you're visiting the Oudsberg, look for designated parking areas near the Vlaams Natuurreservaat Oudsberg. It's advisable to check local signage upon arrival for the most accurate parking options.
Visitors frequently praise the unique experience of walking through the sand hills, often describing it as a 'mini-desert in the woods.' The panoramic views from the Oudsberg Sand Dune are a major highlight, as are the peaceful resting spots at places like Our Lady of the Woods Shrine (Mariaberg). The blend of untouched forests, colorful heathlands, and fens also contributes to a highly appreciated natural experience.
Yes, for those seeking a bit more challenge, highlights like Up the dune hollow offer a more strenuous climb. While the sand can be loose, the reward of reaching the top and the views it provides is often cited as worth the effort. The terrain around the dunes can be quite varied, offering different levels of difficulty.


Extend your search for the best caves by checking out these guides of the top ones in Gruitroderbos: