The Stronetta, or Rio Stronetta (Italian pronunciation: [ˈriːo stroˈnɛtta]), is a small mountain torrent in the Province of Verbano Cusio Ossola, northern Italy.

It rises in the mountains to the south-east of Gravellona Toce and flows through the industrial district of the town, and into Lago Maggiore at Fondotoce, a locality of Verbania.

A peculiarity of the river is that in places it is entirely covered by vegetation, and can be difficult to make out.

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