La Mandria Regional Park is a park in the communes of Venaria Reale and Druento, near Turin, northern Italy. Founded in 1978 by the regional council of Piedmont, it occupies a wide area between the Stura di Lanzo torrent and the north-western part of Turin and Venaria.
It is the largest enclosed park in Europe, with a surface of some 3,000 hectares, bounded by a 35 km long wall built in mid-19th century by Victor Emmanuel II of Sardinia, who had moved in the castle here (the Borgo Castello) the residence of his morganatic wife, Rosa Vercellana. The park included one of the last relics of the large forest which once covered the whole Po Plain. Fauna includes wild boars and reindeers. The park has also breeds of horse races which are considered in risk of extinction. There are many accesses to the park: the gate of the avenue Bella Rosina, Fiano and the gates of Robassomero: Oslera Cascina, Cascina La Falchetta and Royal Park I Roveri, and of course those from Turin.
The existence of a village in the wood is documented since the 18th century, when Victor Amadeus II of Savoy built here the stables of the nearby Royal Palace, within a royal hunting reserve active since the 16th century.
Filippo Juvarra worked at the castle in the 1720s. In 1860 Victor Emmanuel ordered the enlargement of the village (designers included Ernesto Melano), turning it into a castle with a surface of 35,000 m². The new structure had a rectangular shape measuring 280 x 100 m with three internal courtyards divided by rows of trees. The king wanted here a private residence (not belonging to the royal estates) to live with his morganatic wife, Rosa Vercellana. An apartment was built for her family by Domenico Ferri. In 1861 the structure was expanded with the "Castle of the Lakes", a neo-Gothic wing and a fountain of a sea horse fighting a triton by Vincenzo Vela.