The mouth of the Giona in Lake Maggiore
|Water code||CH : 4619|
|Drain over||Lake Maggiore → Ticino → Po → Mediterranean|
|source||on the southern slope of Monte Tamaro
|muzzle||at Maccagno in the Lago Maggiore
|Height difference||1602 m|
|Catchment area||47.52 km²|
The Giona is a 15 km long river that rises in the Swiss canton of Ticino and reaches Lake Maggiore on Italian territory . The source is on the southern slope of Monte Tamaro . The Giona flows largely in a south-west direction and affects the municipality of Indemini . It has a length of 15.1 km, of which 4.6 km are in Switzerland, 10.5 km in Italy and 120 meters on the border.
In Switzerland it flows through the Val Giona , which continues in Italy with the Valle Veddasca . For the time being, the municipal boundary between Maccagno con Pino e Veddasca and Curiglia con Monteviasco runs along the Giona. The village of Maccagno lies on both sides of the river mouth on an alluvial cone that extends far into Lake Maggiore .