Lesse
 The Lesse is a river in the Ardennes in the Walloon region of Belgium. It is a right tributary to the river Meuse.The source of the Lesse is near Libramont-Chevigny in the Belgian province of Luxembourg. The Lesse flows roughly in north-western direction. Near Han-sur-Lesse (commune of Rochefort) the entire river goes underground flowing through limestone caves.