Lake Pergusa (Pergoussa, Πυργούσσα in Ancient Greek) is a lake in Sicily, set between a group of mountains in the Erean Mountains chain near Pergusa, 5 km from Enna, Italy. It is a vital stop in the migratory trajectory of a great number of birds. In addition to birds, which are by far the main inhabitants of the Pergusa nature reserve, there are also interesing species of mammals, reptiles, amphibians and invertebrates found here.