Le Cheslé is a Celtic camp just southwest of the village of Bérismenil in the municipality of La Roche-en-Ardenne in the Belgian province of Luxembourg. The camp is difficult to reach and is located on a rocky promontory that rises 80 meters above the river Ourthe in the brook valley like a kind of peninsula. In the east, south and west the rock is surrounded by the Ourthe, which meanders around the high plateau. On the north side is the only access, which was originally only accessible via a narrow path on a ridge. The fort's grounds cover 14 hectares. The fortress is largely protected by the steep walls and on the less steep parts a double wall of earth, slate and wood has been constructed over 1750 meters long.
Between the eighth and sixth centuries BC. the fort was probably not inhabited continuously, but was used as a shelter for the inhabitants of the nearby villages.
The area has been undergoing extensive archaeological research since 1960. In 1980, the structure on the north side of the fortress was reconstructed on site by the National Excavation Association. With its excavations, the Free University of Brussels has investigated the structure of the barrier wall in the most vulnerable spot of the fortress, which was erected 6 meters high.
Today it is a nature reserve with excavated and reconstructed walls. From the camp one has a view over that part of the valley of the Ourthe.