When you come to visit Seine-et-Marne, you may well hear talk of the “E.N.S”, the abbreviation of Espaces Naturels Sensibles, or Sensitive Nature Area. This term refers to sites which present certain specificities in terms of animal or plant life, and which have to be protected. But it can also refer to former industrial zones that have been redeveloped into sites for an enjoyable country stroll. By receiving this classification, these sites can be protected and rehabilitated. 12 classified sites are open to the public in Seine-et-Marne.