Kayaking in Bouillon Semois Descent in the Heart of the Ardennes

Bouillon occupies an exceptional geographical position on the Semois. Dominated by the oldest castle in Belgium, the town offers a unique setting where medieval heritage and wild nature meet. The river carves deep meanders here, nestled between wooded hills that protect from the wind and create a microclimate favorable for kayaking.

For over 30 years, Semois Kayak has offered descents departing from the Bouillon region. Our routes cross landscapes classified as the Major Heritage of Wallonia: forests of century-old oaks and beeches, shale cliffs, and alluvial meadows where wildlife (grey herons, kingfishers, otters) can be observed from the water.

The kayak descent from Bouillon is suitable for families with children from 6 years old as well as for experienced paddlers looking for a longer and more technical route. With a regulated flow and accessible rapids, the Semois is the ideal river for a first canoeing or kayaking experience in Belgium.

A landscape shaped over 350 million years

The schisto-sandstone Ardennes substrate that forms the banks of the Semois at Bouillon dates from the Primary Era. These resistant rocks explain why the river did not carve a vertical canyon, but instead wound around obstacles, creating the spectacular meanders that have made the Giant's Tomb and Frahan world-famous.

Between Bouillon and Bohan, the Semois drops from 134 to 95 metres above sea level — a 39 m drop over 40 km that explains its calm and regular character, ideal for leisure kayaking. The average flow at Membre is 15 m³/s, with seasonal variations from 3 m³/s (summer low water) to over 80 m³/s during winter floods.

The valley is listed as Major Heritage of Wallonia and integrated into the Semois-Attert Natural Park. No fewer than 12 Natura 2000 zones follow one another between Bouillon and Vresse, sheltering emblematic species such as the European otter (Lutra lutra), the kingfisher (Alcedo atthis), and the rare black stork (Ciconia nigra).

Bouillon and the Semois : 1,000 years of shared history

Bouillon Castle was built on a rocky promontory encircled by a meander of the Semois — the river formed a virtually impregnable natural defence. Godfrey of Bouillon sold the fortress to the Bishopric of Liège in 1096 to finance the First Crusade. This same river witnessed centuries of tanners, millers, and log drivers before tourism replaced industry in the 20th century.

Kayaking on the Semois began in the 1960s, driven by the first sports clubs in Bouillon. Today, more than 80,000 kayakers per season descend the Semois, making it one of the 5 most frequented waterways in Belgium for nautical tourism.

Our base Kayak Semois Ardenne is part of this tradition with over 30 years of expertise on Ardennes rivers. Our guides know every meander, every rapid, and every secret beach between Bouillon and Bohan. The full descent of the Semois ranks among the most memorable experiences you can have in the Belgian Ardennes.