Travel by bus number 10 to Bignasco and then with the Post bus to Sonlerto. Visiting this old village, it is simple to guess the characteristics of the Bavona Valley.
From the small village of Sonlerto begins the beautiful and easy walk on a well marked path across meadows and along the river to the very imposing waterfall of Foroglio.
From there it's possible to continue on foot (2 hours walk) or travel by Post bus to Bignasco. Then, the bus number 10 will bring you back to Locarno.