Lesse

The Lesse () is a river in the Ardennes, in the Walloon region of Belgium. It is a right tributary to the river Meuse.
Geography.
The Lesse is long. It flows roughly in a northwestern direction. Its source is near Libramont-Chevigny, in the Belgian province of Luxembourg. The mean discharge for Anseremme between 1995 and 2004 was 19.0 m3.
The watershed of the Lesse Basin, with an area of , has about . With only 62,500 people living there, it is the least densely populated of all small watersheds of Walloon region.
Part of the watershed of the Lesse is on limestone where there are some karstic phenomena. Near Han-sur-Lesse (commune of Rochefort), by the "Gouffre de Belvaux", the entire river goes underground, flowing through limestone caves.
The Lesse flows into the river Meuse in the town of Anseremme, commune of Dinant, Namur province.
Tributaries.
From its source to its mouth, the main tributaries of the Lesse are:
Attractions.
The valley of the Lesse and this part of the Ardennes are covered with forests. The area surrounding the caves is the National Park Lesse et Lomme. On the mountains along the lower part of the river there are several castles. The route of the former railway line from Houyet to Rochefort is used as a hiking and cycling trail.
Many of the caves along the banks of the Lesse are important archaeological sites - these include the Trou de Chaleux (by the Cirque de Chaleux), and the Trou des Nutons and Trou du Frontal at Furfooz.
It is possible to go down the Lesse in kayak or canoe from Houyet to Anseremme.