The Kalmius (Ukrainian: Кальміус) is one of two rivers
flowing through the Ukrainian city of Mariupol. The other river called the
Kalchik flows into the Kalmius. The Kalmius flows into the Sea of Azov near the
Azovstal steel manufacturing complex in Mariupol. Kalmius was the name of a
16th-century Cossack encampment where the city of Mariupol was later founded. The
Kalmius Trail was a Tatar raiding trail, one of the branches of the Muravsky
Trail.
After an offensive by the separatist forces of the Donetsk
People's Republic in August 2014 during the War in Donbass, in southern Donetsk
Oblast the river became the boundary between Donetsk People's
Republic-controlled territory on the east bank of the river, and Ukrainian
government-controlled territory on the west bank. A Donetsk People's Republic unit was named
"Kalmius" Battalion.