Two rivers cross it : the Vis and the Virenque, dry in some parts of their course. These particularities and the geographical position of the southern, continental, oceanic and mountainous influences give the « Grand Site » of the Cirque de Navacelles unique and exceptional bioclimatic conditions.
The altitude, the climate, the character of the rocks and human activities (essentially agropastoralism) have shaped a mosaic of environments favourable to an excepional biodiversity.
The schema below present the different environments :
• The open spaces on the Causse
• The gorges and the cliffs
• The river
• The « Cirque » and the hamlet