The Topolog is a river in Dobruja, Romania, a right tributary of the Danube.Cursuri de apă din județul Constanța înscrise în Cadastrul Apelor din România It rises near the commune of Topolog, in the Casimcea Plateau of Tulcea County forming the Topolog Depression, which divides the Plateau in two parts: the Casimcea Plateau proper (to the east) and the Hârșova Plateau (to the west). Initially, it flows from northwest toward southeast, but eventually, it changes to east-west, spilling into Lake Hazarlâc, which is connected with the Danube. Its length is and its basin size is .
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