The Ellero is a 34.6-kilometre (21.5 mi)[1] long river in northwestern Italy (Piedmont).

Its source is in Pian Marchisio, a large plateau of the Ligurian Alps.

It flows northwards digging the Valle Ellero, which ends in the Po plain near Roccaforte Mondovì.

[3] The Ellero then follows its course through the plain turning NE, crosses Villanova Mondovì (where it gets from right hand the Maudagna, its main tributary) and then after Mondovì, with some meanders, reaches Bastia Mondovì where it joins the river Tanaro.

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