The Asău is a left tributary of the river Trotuș in Romania. Its source is located in the Tarcău Mountains. It discharges into the Trotuș in the village Asău, near Comănești. Its length is and its basin size is . Tributaries The following rivers are tributaries to the river Asău (from source to mouth): Left: Asăul Mic, Geamănele Mari, Izvorul Negru, Rugina, Rășcoiu, Păltiniș, Izvorul Alb, Pârâul Tulbure Right: Preotese, Cetățeni, Pârâul Caprei, Pârâul lui Iacob, Agăstin, Barta, Chicera References Rivers of Romania Rivers of Bacău County