Abstract: Senancour reflects on nature in his intellectual work (Rêveries, Libres méditations. . .) and his novels (Aldomen, Oberman, Isabelle) and thereby reinterprets the tradition of the Enlightenment, opens up Romantic perspectives, and lays out the lineaments of an ecocriticism. He thinks of the relationship of man to nature as man’s relationship to his nature, a sort of denaturation, of which the concept of extension, understood as a desire that denatures itself in delirium, would be the anthropological operator.