Visconti Park was the private park of the Visconti and Sforza families, lords, and dukes of Milan. Located in Lombardy, northern Italy, it extended between Pavia Castle and the Certosa di Pavia monastery. It covered an area of about 2,200 hectares (22 km2) and was encircled by walls about 25 kilometres (16 mi) in length. It was founded in 1360 by Galeazzo II Visconti and enlarged by his son Gian Galeazzo.