The barrier of Lumières

From here, you will be overlooking the valley floor of Calavon dominated by the presence of natural environments (alluvial forest and pebble banks) shaped by the river at the whim of floods. There at the Hameau de Lumières, the plain bears the marks of the narrowing hilly area, creating a barrier effect. The slopes are made up of a sandy limestone of marine origin: molasse. It was formed 20 million years ago when the Mediterranean sea went up the Rhone Valley.