Established in 1976 and enlarged in 2017, it covers over 8,000 hectares of woods and moorlands (locally knowns as groane) in the upper Po Plain northwest of Milan (between 160 and 300 meters above sea level), across the territory of 28 municipalities in the provinces of Milan, Como and Monza.

[1][2] The park was originally called Parco delle Groane and had an area of 3,695 hectares, but grew to over 8,200 in December 2017, when it absorbed the former PLIS Parco della Brughiera Briantea and the Fontana del Guercio Natural Reserve.

[6][7] Among the many bird species, the European green woodpecker, the great spotted woodpecker, the common kestrel, the common buzzard, the European honey buzzard, the Eurasian sparrowhawk, and the long-eared owl can be mentioned.

Mammals include squirrels, dormouses, voles, hares, hedgehogs, moles, shrews, vesper bats, beech martens, weasels, foxes, badgers and in recent times, red deer.

[8][9] The park is crossed by sixteen hiking paths, with a combined length of 100 kilometres.