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Olen

Top 20 Natural Monuments around Olen

Best natural monuments around Olen include diverse natural areas within the Belgian province of Antwerp. The region features the Grote Nete river, offering picturesque landscapes, and the notable Het Zwart Water, a fen characterized by its dark water and bird habitat. Olen's natural environment also includes greenspaces with woods and open areas, providing opportunities for walks amidst varied flora. These locations showcase the geological history and ecological value of the area.

Best natural monuments around Olen

  • The most popular natural…

Last updated: June 26, 2026

The Zwart Water

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Het Zwart Water consists of a fen with woods on the edge, gale thickets, willow breeches and lean grassland. In the middle of the water there is a floating platform …

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A very special location ... not so much the bridge but "Het Trammetje" = is a unique Lock system from a bygone era. Definitely think about it. How simple it can be sometimes ...

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The name "Slapende Reus", meaning "Sleeping Giant", does not come from this work of art by the architect and artist duo Gijs Van Vaerenbergh - it was rather inspired by …

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Devil's Pit Pond

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You can listen to the story of the emergency telephone while sitting on a couch.

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Hertberg Ponds

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Spend some time by the water in a wooded area...

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From Flanders to the Ardennes — GR 5 in Belgium

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From Flanders to the Ardennes — GR 5 in Belgium

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Fred Urrutia

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Dominiek Van Dooren
May 25, 2026, Vennen van Hertberg

Good water quality is essential for biodiversity. Therefore, it is important that the nutrient-rich soil layer is not disturbed. The water then becomes cloudy and certain plants, such as algae, begin to proliferate. Algae consume a lot of oxygen at night, resulting in the animals in the pond having a difficult time. To protect this special biotope, passers-by must leave the water undisturbed. (Information board on site)

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Many captivating stories have been written about this well (not just any well). The first probably dates back to 1571, when Lieske Coolbonders committed suicide by drowning herself in the well while the devil himself was pursuing her. Lieske was the illegitimate daughter of Katrien Coolbonders, who was raped by a Spanish nobleman. The nobleman was murdered by Katrien's husband. The body was first dumped in the Devil's Well. Later, it was buried somewhere nearby. (Efkesweg.be)

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Viewed from above, with a little imagination, the Kempen Ridge's relief can be seen as if a giant were sleeping beneath the landscape. Because of the vegetation on the sand dunes, they no longer move, and the giant's slumber is not disturbed. In 2018, Gijs Van Vaerenbergh's artwork, "A Giant Sculpture," was unveiled. It was placed on the 30-meter-high summit of the Hoge Mouw sand dune. (Efkesweg.be)

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A beautiful bridge over the Grote Nete river, not far from Merode Castle. You must cross the bridge to continue along the Grote Nete.

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In a thunderstorm, it is best not to touch it, a lightning strike can be dangerous. Inside it is a Faraday cage and you are safe, but what if you touch the corten steel at the moment that lightning strikes? Still, stay away from this beautiful work of art in a thunderstorm!?

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bridge over the large Nete, over which the path between Westerlo and Bergom runs.

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Els Q
July 1, 2024, Duivelskuil Pond

Fun to spin the wheel here and listen to the story around this mysterious pool...

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A special one... you must see it

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Frequently Asked Questions

What are some unique natural features to explore in Olen?

Olen offers diverse natural features. You can visit The Zwart Water, a unique fen known for its dark, peat-rich water and importance as a bird habitat. The Grote Nete river also flows through the area, providing picturesque riverine landscapes, hayfields, and alder groves. Additionally, the region features the Kempen ridge, home to De Hoge Mouw with its sleeping giant, an impressive hill of ferrous sandstone.

Are there family-friendly natural monuments around Olen?

Yes, several natural monuments in Olen are suitable for families. The Zwart Water is a great spot for birdwatching and enjoying a tranquil environment. The area around the Bridge over the Grote Nete (Het Trammetje) offers scenic views and opportunities for walks. De Hoge Mouw with its sleeping giant is also popular, with its large sandy areas where children can play and discover the artwork.

What kind of historical elements can be found within Olen's natural settings?

The Grote Nete river features "Het Trammetje," a unique lock system from a bygone era that is deeply integrated into the natural river setting, offering a glimpse into historical water management. Additionally, Kruiskensberg Pilgrimage Site, while a religious building, is set within a natural forest and features historical wells and chapels dating back centuries, with legends of healing associated with its spring.

Where can I go for easy walks or circular routes near Olen's natural monuments?

The Grote Nete valley is ideal for walking, with numerous routes available along its picturesque riverine landscapes. The greenspace near the Umicore business park in Sint-Jozef-Olen also offers peaceful walks amidst diverse flora. For specific routes, you can explore the Running Trails around Olen guide, which includes various paths suitable for walking.

Can I spot wildlife, especially birds, at Olen's natural monuments?

Yes, The Zwart Water is particularly known as a significant bird habitat. Its floating platform serves as a resting and nesting spot for various bird species, making it an excellent location for birdwatching. The tranquil environment of the fen and surrounding woods provides ample opportunities to observe local wildlife.

What outdoor activities can I do near these natural monuments?

Beyond exploring the natural monuments themselves, Olen offers various outdoor activities. You can find extensive MTB Trails around Olen, including routes near The Black Water. There are also numerous Road Cycling Routes around Olen that pass through scenic landscapes, and Running Trails for those who prefer jogging.

Is there a natural monument in Olen with a unique geological history?

Absolutely. The Zwart Water has a fascinating geological past. It was once an open dune landscape where wind activity exposed a hard subsoil layer, leading to water collection and the formation of a pool. Over time, peat developed, giving the water its distinctive dark color. This transition from dunes to a peat-rich fen makes it a unique natural wonder.

Are there any natural areas in Olen that are managed for their ecological value?

Yes, the greenspace near the Umicore business park in Sint-Jozef-Olen is a 23-hectare area consisting of woods and open areas. It is managed by Kempens Landschap in collaboration with partners to continuously enhance its landscape and ecological value, providing a peaceful environment for walks amidst diverse flora.

What is the best time to visit the natural monuments in Olen?

The natural monuments in Olen can be enjoyed year-round, with each season offering a different experience. Spring and summer are ideal for lush greenery and birdwatching, especially at The Zwart Water. Autumn brings beautiful foliage along the Grote Nete, while winter offers tranquil, crisp walks, particularly in the wooded areas like those surrounding De Hoge Mouw.

Are there any natural monuments in Olen that are also historical sites?

Yes, the Bridge over the Grote Nete (Het Trammetje) is a natural monument that incorporates a unique 19th-century lock system, protected by Monumentenzorg, offering historical context within its natural setting. Additionally, Kruiskensberg Pilgrimage Site, set in a forest, has historical significance with its wells and chapels dating back to the 17th century.

What do visitors appreciate most about Olen's natural monuments?

Visitors frequently highlight the serene natural beauty and tranquility of places like The Zwart Water, often mentioning the sounds of birds and the reflections on the water. The unique historical elements, such as the lock system at "Het Trammetje" along the Grote Nete, are also highly appreciated for their blend of nature and heritage. The impressive landscape and the artwork of the 'sleeping giant' at De Hoge Mouw also receive positive feedback.

Are there any natural monuments in Olen that are also nature reserves?

Yes, De Hoge Mouw with its sleeping giant is situated within a nature reserve. This area is part of the Kempen ridge, characterized by its unique landscape of ferrous sandstone hills, forests, heath, and sand. Devil's Pit Pond is also a nature reserve, offering a varied Kempen landscape with heathland, fens, and bog.

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