The municipalities of Osogna, Lodrino, Iragna and Cresciano merged on April 2, 2017.

[2] On October 18, 2015 the citizens of Osogna, Lodrino, Iragna and Cresciano voted to merge their municipalities into the new municipality of Riviera as the name of their district.

[3] The merger was enacted by the Grand Council of Ticino.

The municipality is located in the Riviera district south of Biasca and north of Bellinzona on both banks of the Ticino.

[6] The rocks of the region consist mainly of gneisses and granites (some quarries are operated in Lodrino).