Special nature
The Lange Bretten
Between Sloterdijk and Halfweg lies the Lange Bretten, an elongated urban wilderness of reeds, scrub, water, muddy paths and open grassland. Railway lines, harbour edges and residential districts remain close, yet a surprisingly rich nature area has developed among these urban structures. Bluethroats, pine martens, waterbirds, insects and large grazers find space in a landscape that looks wild but is carefully managed.
Why go here?
The Lange Bretten shows how rich urban nature can become when wet ground, reeds, grassland, scrub and woodland patches remain connected. During a walk, quiet muddy stretches alternate with open fields, while trains and harbour activity never disappear entirely. The area can be explored freely along public paths; no ticket, museum visit or guide is required.
What do you see?
An elongated green zone with reed beds, ditches, wet hollows, flower-rich rough grassland, woodland patches and open fields. Grazing tracks are visible beside the paths, and marsh birds may appear above the reeds. Railway lines, roads, harbour sites and high-rise buildings remain visible or audible in places. Paths can be muddy and uneven, so sturdy footwear is sensible, especially after rain.
What can you see when?
Choose a month to see which animals, plants or fungi are most likely then.
Bluethroat
Most likely in reeds, wet rough vegetation and low scrub, where males may sing conspicuously from a stem or shrub top in spring.
Western marsh harrier
Watch above reed beds, wet low ground and open areas for a low hunting flight with slow wingbeats.
Kingfisher
Along ditches, banks and quiet water bodies, a blue flash may suddenly skim low over the water.
Sedge warbler
In spring and summer, look and listen in reeds and rough bank vegetation, where it is often heard before it is seen.
Pine marten
The pine marten itself is rarely seen; here it belongs mainly to dense woodland patches, rough edges and quiet stretches where it can hunt and move unseen.
Bats
On mild evenings, bats may hunt along water, woodland edges and open places where insects gather.
Dragonflies
Most visible above ditches, wet low ground and sunny banks, where water and rough vegetation lie close together.
Butterflies of rough vegetation and flower-rich edges
Likely on warm, flower-rich places along paths, open patches and rough edges.
Bees and other pollinators
Flower-rich rough vegetation and sunny edges are important in spring and summer for bees, hoverflies and other pollinators.
Common reed
Reed defines the wet character of the Lange Bretten and provides cover, song posts and breeding space for many marsh birds.
Highland cattle
The grazers keep parts of the area open and make the management of the urban wilderness visible through grazing and tracks.
Red fox
In quiet edges and rough cover, the fox can move well, although an encounter usually remains a matter of luck.
Why it matters
The Lange Bretten preserves elements of the wet peat and polder landscape west of Amsterdam and connects the city with the green areas towards Halfweg and Spaarnwoude. Its elongated structure provides animals with cover, food and routes through a heavily built-up environment. The area also shows that spontaneous growth and active management can reinforce one another: grazing, water management and quiet zones sustain a varied mosaic of habitats.
The deeper story
The Lange Bretten extends as a green strip between Sloterdijk and Halfweg. Railway lines, roads, business parks, harbour zones and residential districts lie on either side. Yet the landscape changes as soon as the path leaves the buildings behind. Reeds close off the view, ditches glimmer between the vegetation and the ground becomes softer. On wet days, mud clings to your shoes. Trains remain audible, but their sound belongs to a different world from the rustling reeds and the calls of waterbirds.
Beneath this modern urban nature lies an older landscape. For centuries, the western side of Amsterdam consisted of low peat and polder land with ditches, wet grassland and soft soils. Urban expansion, railways and harbour development fragmented that open country from the nineteenth century onwards, especially during the twentieth. Not everything disappeared. Wet hollows, waterways and parts of the old field pattern survived in the Lange Bretten. They form the foundation on which the present nature area developed.
The area is therefore not a remnant preserved unchanged from the past. It is young nature on old ground. Reed beds, flower-rich rough grassland, meadows, woodland patches and scrub lie close together. The many boundaries between wet and dry, open and enclosed, sunny and sheltered create a wide range of habitats. In spring, bluethroats sing from the reeds. Sedge warblers often remain hidden among the stems, while a marsh harrier may quarter low above open ground. Along quiet water, a sudden blue flash may reveal a kingfisher.
The variation also matters beyond the birdlife. Dragonflies hunt above ditches and sunny banks. Bees, hoverflies and butterflies feed in flowering areas. In the evening, bats follow waterways and woodland edges where insects gather. Pine martens are rarely seen, but dense cover and green links give them shelter and routes through the area. Foxes use the same quiet margins. Such animals are not constantly on display; their presence is more often suggested by a brief sighting, a track in the mud or a sudden movement in the scrub.
The wild appearance does not maintain itself. Without management, open grassland and wet tall vegetation would gradually close over. Grazing animals help preserve differences in height and density. Their feeding, resting places and tracks create room for low plants beside taller grass and shrubs. Water management keeps ditches and wet areas functioning, while other sections are deliberately left undisturbed. The landscape is guided without being manicured. Management protects its variety without turning it into a conventional city park.
Its elongated shape adds to its importance. The Bretten forms a green connection between Amsterdam and the countryside around Halfweg and Spaarnwoude. Animals can move through the urban fringe along water, reeds, grassland and woodland patches. For species that need cover and quiet stepping stones, such a corridor is more valuable than an isolated green space. The area's ecological importance therefore depends not only on what breeds or grows here, but also on its role within a wider network.
No ticket, museum visit or guide is needed for a walk. Public paths cross different parts of the area, and cycling is possible on the broader routes. After rain, the ground may be waterlogged, and not every path is suitable for people with limited mobility. A slower pace reveals more: song from the reeds, dragonflies above a ditch, tracks left by grazers or a raptor turning low over a field. Infrastructure sometimes remains emphatically present. Rather than simply spoiling the scene, it shows how much nature can survive within a busy urban edge.
That position also makes the Lange Bretten vulnerable. Urban nature without a formal appearance is easily mistaken for unused land. At the same time, recreational pressure is increasing as more people live and work nearby. Between 2025 and 2030, work is therefore being carried out to balance ecological value and access more effectively. The challenge is clear: to welcome walkers and cyclists without losing quiet zones, wet soils and green connections. This is what gives the Lange Bretten its meaning. It is not untouched wilderness beyond the city, but a living landscape that has retained enough space between railway, harbour and housing to remain wild.
Further reading
- De BrettenGemeente Amsterdam
- De Bretten: verbetering natuurgebiedGemeente Amsterdam
- Lange BrettenLandschap Noord-Holland
- Lange BrettenNatuurwegwijzer