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a river in Donetsk Oblast, Ukrainian SSR. It measures 209 km long, and drains an area of 5, 070 sq km. TheKal’mius originates on the southern slopes of the Donets Ridge and empties into the Sea of Azov. The river is fed primarily bysnow. The mean annual flow rate at the settlement of Primorskoeis 6. 23 cu m/sec. The Kal’mius is used for irrigation and industrial water supply. The Upper Kal’mius Reservoir is located inthe upper reaches; the reservoir is part of the hydraulic engineering complex of the Severskii Donets-Donbas Canal. The cities of Donetsk and Zhdanov (at the mouth) are situated on the Kal’mius.