There are numerous ecosystems present around the lake which offer a large diversity of remarkable species. In some areas there are categories such as fire (Epicéas, Douglas), oak, ash, hazel, alongside of water of the lake
Classified as an ecologic natural zone of, faunistic and floristic interest (ZNIEFF) for its flora (swamp, Scirpe, Carex), the lac of Montagnès owes its sourcing to the feeding of numerous