The Izvorul Negru is a right

tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drai ...

of the river Uz in

Romania Romania ( ; ro, România ) is a country located at the crossroads of Central, Eastern, and Southeastern Europe. It borders Bulgaria to the south, Ukraine to the north, Hungary to the west, Serbia to the southwest, Moldova to the east, and ...

. It discharges into the Uz in Sălătruc near

Dărmănești Dărmănești (; hu, Dormánfalva) is a town in eastern Romania, in Bacău County, in the valleys of the Trotuș and Uz rivers. The town is named after one of its leaders, "Dărman" and the earliest reference to the town is from the 16th centu ...

.Izvorul Negru (jud. Bacau)
e-calauza.ro Its length is and its basin size is .

References

Rivers of Romania Rivers of Bacău County {{Bacău-river-stub