Olona

General data
- Water type: River
- Progression: Po River -> Adriatic Sea -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates: Subtropical
- Continents: Europe
- Countries: Italy
Description
The Olona (Olona in Italian; Ulona, Urona or Uòna in Western Lombard) is an Italian river belonging to the Po Basin, 71 kilometres long, that runs through the Province of Varese and Metropolitan City of Milan whose course is developed entirely in Lombardy.