The Province of Como (; ) is a province in the north of the Lombardy region of Italy and borders the Swiss cantons of Ticino and Grigioni to the North, the Italian provinces of Sondrio and Lecco to the East, the Province of Milan to the south and the Province of Varese to the West. The city of Como is its capital — other large towns, with more than 10,000 inhabitants, include Cantù, Erba, Mariano Comense and Olgiate Comasco. Campione d'Italia also belongs to the province and is enclaved in the Swiss canton of Ticino.