Sisteron, pearl of Haute-Provence Between Provence and the Alps, on the banks of the Durance river, Sisteron is a must-see town on the Route Napoléon. City gateway to Provence and the Baronnies Provencal Natural Park, it deserves its nickname "Pearl of Haute-Provence" as it attracts the eye, by its natural location but also its fame. Nestled at the foot of its famous citadel which dominates the landscape, the city stretches out facing the Baume rock, recognizable by its vertical layers of limestone, renowned throughout the world and considered by geologists to be a real curiosity. The town of Sisteron offers a maze of stairs and small vaulted streets called "andrones", naturally following its so picturesque staging, to reach the alien Citadel, of which Henri IV liked to say was "the most powerful place. strong of his kingdom ”.