Onsernone is a municipality in the Swiss canton of Ticino, near the city of Locarno. The river Isorno runs through this valley. The municipality was created in 1995 by a merger of Comologno, Crana and Russo.On 10 April 2016 the former municipalities of Vergeletto, Gresso, Mosogno and Isorno merged into Onsernone.
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