The Olona (Olona in Italian; Ulona, Urona or Uòna in Western Lombard) is an Italian river belonging to the Po Basin, 71 kilometres (44 mi) long, that runs through the Province of Varese and Metropolitan City of Milan whose course is developed entirely in Lombardy.The river born at 548 m s.l.m. in the Fornaci della Riana locality at the Rasa of Varese, at the Sacro Monte di Varese, within the Campo dei Fiori regional park.
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