The Flumini Mannu is a river in southern Sardinia, Italy.

Its springs are located in the hills east of Sardara.

It flows into the Stagno di Cagliari after a course of 42.14 kilometres (26.18 mi).

The river's main tributaries are the Riu Bellu and the Rio Sitzerri, which for most of the basin of Monte Linas massif's waters.

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