Brenno (river)

The Brenno is a river about 36 kilometres long in the canton of Ticino in Switzerland. It flows through the Blenio valley in a predominantly southerly direction and flows into the Ticino at Biasca.

The main source of the Brenno rises below Piz Gaglianera in the Cogn dei Lavazz area. It flows through the Val Camadra section of the valley, receives the outflow of the Lago di Luzzone reservoir at Campo and joins the Brenno di Santa Maria flowing down from the Lukmanier Pass in the Olivone basin.

In the lower reaches - between Malvaglia and the Buzza di Biasca landslide cone - the Brenno is very wild. Its gravel deposits and those of its left tributaries Orino and Lesgiüna occupy the entire width of the valley floor there.