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The river passes through Milan mostly under road level. In Milan the Olona cedes part of its water to the Lambro meridionale, to later continue southward
in the Bassa (lower Lombard Po Valley). The Olona flows into the Po near San Zenone al Po.
while in the Italian wiki's article it is said that the Olona river does not continue after Milan since it flows into the Lambro Meridionale just a few meters after its tunnel-crossing under the Naviglio Grande. The river carrying the name "Olona" that meets the Po near San Zenone is probably the ancient southern branch of the river, before the 1st century deviation by the Romans, but today it's only a secondary water stream that originates from the union of other, smaller streams near Bornasco, many kilometers south of Milan.
