Bovenlopen Zwalm

Bovenlopen Zwalm is a natural landscape in the municipality of Brakel, sub-municipality of Opbrakel, in the province of East Flanders, Belgium, within the hilly region known as the Flemish Ardennes. The name literally means "upper reaches of the Zwalm" and refers to the network of small headwater streams from which the Zwalm river is formed.

Where does the Zwalm river begin?

The Zwalm itself takes shape in Brakel through the confluence of several smaller streams. The most important are the Sassegembeek, which rises in the Brakelbos forest, the Dorenbosbeek, which originates in the Livierenbos forest, and the Verrebeek, which starts in the combined forest areas of Livierenbos and Hayesbos. Only once these streams merge does the resulting watercourse become large enough to carry the Zwalm name. From there the river flows through the Zwalm valley and empties into the Upper Scheldt on the border between Nederzwalm and Welden. The forests feeding the streams that in turn feed the Zwalm lie further west, near Vloesberg (Flobecq).

Why is this area ecologically valuable?

The upper reaches of the streams around Brakel stand out for their very good water quality and for structural features typical of undisturbed headwater brooks — meandering channels, varied streambeds and natural bank vegetation. This supports species that depend on clean, well-oxygenated water and that are increasingly rare in more heavily modified lowland streams. The Sassegembeek in particular is noted for a fish community that is unusually complete for a headwater stream.

Indicator species recorded in these waters include the brook lamprey and the river bullhead, both protected under the EU Habitats Directive, as well as brown trout, a species on the red list of threatened freshwater fish. The simultaneous presence of all three is a strong signal of high ecological water quality and relatively limited pressure from pollution or channel modification.

What can visitors do here?

A signposted walking route, "Langs de bronnen van de Zwalm" ("Along the sources of the Zwalm"), of roughly 10 kilometres, follows the headwater area and links the different streams that together form the upper Zwalm. The route passes through forest and valley landscape typical of the Flemish Ardennes — gently rolling terrain, small deciduous woodlands and damp riverside meadows. It suits visitors looking for a quiet walk close to nature, away from the crowds found at the region's better-known viewpoints.

The area is under the care of a nature conservation organisation, meaning the most sensitive stretches of stream and headwater forest are protected from disturbance, and visitors are expected to keep to the marked paths.

Frequently asked questions

Where exactly is Bovenlopen Zwalm located? In the municipality of Brakel, sub-municipality of Opbrakel, in East Flanders, in the Flemish Ardennes region of Belgium.

Which river originates here? The Zwalm river, a tributary of the Upper Scheldt, formed by the confluence of the Sassegembeek, Dorenbosbeek and Verrebeek streams.

What wildlife can be found here? The streams are home to species such as the brook lamprey, the river bullhead and brown trout, all of which need clean, well-oxygenated water.

Is there a walking route through the area? Yes, a signposted route of about 10 kilometres follows the headwaters of the Zwalm.

Is this a protected area? Yes, the area is protected for nature conservation because of the ecological value of its headwater streams.