Its reservoir has an abundance of aquatic vegetation due to its inflow of phosphorus- and nitrogen-rich organic material from agricultural and residential runoff.
A reserve was established in 1997 in order to protect the area's natural and historical landmarks, including Fregellae, Fabrateria Nova, and the lake of San Giovanni Incarico.
(Isola del Ponte Solarato),[2] The first fortification dates back to 702, when the Lombards of Benevento made settlement in order to use the land as a garrison for their raids in the Liri Valley (Arpino, Sora).
In 1139, Pope Innocent II declared war against the King Roger I of Sicily, and his troops destroyed Isoletta during an invasion of southern Italy.
The Chiavesignati, having been defeated in Abruzzo, the Celanos[4] were forced to give away all their conquests and properties beyond Marsica (Molise, Valle Latina) including Isoletta, which then became a possession of a local family, the Spinellos.
Norman Lewis, a British officer in the Battle of Monte Cassino at the time, recounted the events in a book he wrote: "The French colonial troops are on the rampage again.
- Norman Lewis, Naples '44: A World War II Diary of Occupied Italy[6] The patron saint is Santa Maria della Vittoria.
The Ruins of the Roman Empire in the Fregellae archaeological complex is a center of considerable importance for the entire Bourbon period.
Inhabited since ancient times, archaeologists have discovered everything from prehistoric remains, pre-Roman, Roman ruins (Fregellae), medieval, and Bourbon.