
This relief is characterized by a set of ridges where is the highest point of the territory of the Park: the Opies, at 498 m altitude. Dating from the Jurassic, it is one of the oldest rock formations in the Alpilles. From the tower that symbolizes the summit, it is possible to see up to the alpine massifs. ;This tower was a watchtower, built at the dawn of the twentieth century, to monitor the massif against fire. It is now used to house the Mistral adventurers who have reached the summit.