The Lombard language is widely used in Lombardy (North of Italy, main city Milano), in diglossia with Italian. Lombard is a language belonging to the Gallo-Italic group within the Romance languages characterized by a Celtic linguistic substratum and a Lombardic linguistic superstratum. It is a cluster of homogeneous varieties used by at least 3,500,000 native speakers in Lombardy and some areas of neighbouring regions, such as the eastern part of Piedmont and the southern Switzerland cantons of Ticino and Grisons. The language is also spoken in Santa Catarina in Brazil by Lombard immigrants from the Province of Bergamo, in Italy.