Riserva Naturale Speciale Lago di Pergusa (IFF-0531) is a protected area of 403 hectares in the Erei Mountains on the island of Sicily. It was designated as a Nature Reserve in 1995 as an IUCN Management Category IV area.
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The flora in the area which is adapted to the high salinity includes various species of rush (Juncus acutus and Juncus maritimus), Suaeda maritima and glasswort (Salicornia patula) and the atriple (Atriplex prostrata subspecies latifolia),
Fauna in the reserve includes many species of migratory birds which change with the seasons throughout the year.