Best natural monuments around Castricum are primarily found within the expansive North Holland Dune Reserve. This significant natural area features a diverse landscape of dunes, forests, and beaches. The region is known for its unique ecosystems, including areas vital for drinking water production. Castricum offers a variety of natural features for exploration.
Last updated: April 28, 2026
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beautiful landscape
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The water that is pumped into the dunes at De Kwal comes from the IJsselmeer. The water is pumped from the IJsselmeer at Andijk, purified, and transported to Heemskerk via a 52 km long pipe. There it is filtered again and is allowed to enter the dunes at 'de kwal'. There the water slowly seeps into the soil and is naturally freed of bacteria and viruses. After at least 30 days, the clean water is pumped up from a depth of 40 metres, freed of iron and lime and the drinking water is suitable for consumption. 800 litres per second Every second, the daily consumption of 6 people flows out of 'de kwal'. That is approximately 800 litres of water per second (2850 m3 per hour). On an annual basis, this amounts to 25,000,000,000 litres of water.
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Picturesque landscape, there is a lot to discover on, in and next to the water.
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A beautiful water-rich landscape that also functions as a drinking water supply.
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Source in the dune reserve. Always bubbling. The water treatment of North Holland
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Access to the dune area requires a valid ticket. This is available at the vending machine at the entrance to area.
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Beautiful lake landscape in the dune area. The water is then used as drinking water in e.g. Wijk aan Zee.
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Castricum's natural monuments are primarily found within the expansive North Holland Dune Reserve. This area features a diverse landscape of dunes, forests, and beaches. You'll encounter unique ecosystems, including water-rich infiltration areas crucial for drinking water production, and rolling dunes with viewpoints.
The North Holland Dune Reserve is home to a variety of wildlife. You can often spot grazing animals like cows and horses, and if you're lucky, even Scottish Highlanders. The Infiltration Area is particularly good for birdwatching, with species like kingfishers, goshawks, tufted ducks, and common snipes present year-round. During migration seasons, ospreys and northern wheatears can be seen, and winter brings whooper swans and great bitterns.
Yes, several natural monuments in Castricum are family-friendly. The Noordhollands Duinreservaat — Dune landscape with grazing animals is great for families, offering beautiful dunes where children can see dune horses. The Infiltration Area in the Dunes of Castricum also provides picturesque scenery with much to discover for all ages.
The North Holland Dune Reserve offers extensive opportunities for outdoor activities. There are nearly 50 marked walking routes and over 100 kilometers of paved cycling paths. You can also enjoy horse riding on bridle paths. For more specific routes, you can explore options for cycling around Castricum, road cycling, or gravel biking.
Yes, the Infiltration Area in the Dunes of Castricum is a significant natural monument. This beautiful water-rich landscape functions as a crucial drinking water supply. River water from the IJsselmeer is pumped into the dunes, where it is naturally purified as it flows through the sand, creating a unique and picturesque environment.
The De Kwal Water Outlet is where huge amounts of water from the IJsselmeer are pumped into the dunes via a 52-kilometer pipe. This water is then purified within the dunes to become pure Dutch tap water. It's an impressive site showcasing the natural water purification process.
Each season offers a unique experience in the North Holland Dune Reserve. Spring brings blooming elderberry, bird cherry, and hawthorn, attracting numerous butterflies. Autumn is ideal for observing significant bird migrations. Winter offers a beautiful silence along the dunes and beaches, while summer is perfect for enjoying the diverse landscapes and recreational opportunities.
Yes, for those seeking a challenge, the Dangerous slope (10%) — Noordhollands Duinreservaat offers a notable climb within the dunes. While not extremely heavy, it provides a good workout for cyclists and hikers, and offers scenic views.
Access to the Noordhollands Duinreservaat generally requires a dune card or admission ticket. These can often be purchased as daily, weekly, or annual tickets from various sales outlets, including machines at entrances or via smartphone. Some accommodations in Bergen Aan Zee may also include an access card with your stay.
On a dune trail like the Dune trail with grazing cows and horses, Noordhollands Duinreservaat, you can expect to traverse beautiful dune landscapes. You'll likely encounter grazing cows and horses directly on or near the paths, offering a unique and immersive nature experience.
Yes, the higher dunes within the North Holland Dune Reserve, some reaching up to 30 meters, offer splendid panoramic views of the diverse landscape. Many trails and cycle paths lead to these elevated points, providing excellent photo opportunities and a sense of the reserve's vastness.
The Visitor Center De Hoep, located on Zeeweg, provides exhibitions and detailed information about water treatment processes within the nature reserve, as well as insights into the local flora and fauna. It's a great starting point to learn more about the region's unique environmental aspects.


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