In antiquity the river was called Gerrhus or Gerrus (Ancient Greek: Γέρρος). The river was called Tokmak (Nogai: Токмак) by the Nogais.[1][2]
The Molochna is formed by the confluence of the Chynhul and Tokmak rivers, just north of Molochansk. It flows roughly southwards, through Melitopol and into the Molochnyi Estuary in the Azov Sea. Its length is 197 kilometres (122 mi) and its drainage basin is 3,450 km2.[3] A former island in the river contains the archaeological site of Kamyana Mohyla.