The site lies along the Sesia river and its tributaries, on the west Padana plain, north-west of the town of Vercelli. The main land-use is nature conservation. The site was listed in the previous pan-European IBA inventory (Grimmett and Jones 1989) as subsites 1-3 of the IBA `Heronries in the catchment of the upper Po and Sesia Rivers' (former site IT005).
The site includes four large mixed heronries: Garzaia di Carisio, Garzaia di Vettignè, Garzaia di Villarboit (Torrente Druma), and Garzaia di Oldenico/Parco Naturale Lame del Sesia.
BirdLife International (2021) Important Bird Areas factsheet: River Sesia heronries. Downloaded from http://www.birdlife.org on 08/03/2021.