The Rezu Mare is a left

tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''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 into which they ...

of the river Putna in

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

. It flows into the Putna near

Tulgheș Tulgheș ( or colloquially ''Tölgyes'', Hungarian pronunciation: , meaning "place with oak trees in Gyergyó") is a commune in Harghita County, Romania. It lies in eastern Transylvania. The commune is composed of four villages: Hagota (''Hágót ...

. Its length is and its basin size is .

References

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