It then forms the southernmost corner of Switzerland including Chiasso, turning north again outside of Como and now forming the eastern border of Ticino running west of Lake Como, of passing Lake Lugano again west of Lugano and touching Monte Boglia, Cima di Fojorina, Gazzirola, Cima di Cugn, Pizzo Campanile, again reaching 3000 meters at Pizzo Quadro between Val Mesolcina and Chiavenna, and further north to Pizzo Tambo, Splügen Pass and Piz Timun.