Bosco Gurin can be reached from Vallemagia turning to the left in Cevio and going up until the end of Valley of Bosco Gurin, near the Italian border.
It is situated at 1500 m and the village at highest altitude in canton Ticino. In this village the official language is German, it is the only municipality were German is spoken.
In the winter is an interesting ski resort.
Official website: http://bosco-gurin.ch/
Distance from Brissago: 50km ~1hr drive (last part on a very steep and curvy road)
More info: https://en.wikipedia.org/wiki/Bosco/Gurin