Kalmius
 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.Kalmius was the name of a 16th-century Cossack fortress which eventually became the city of Mariupol.The Kalmius Trail was a Tatar raiding trail one of the branches of the Muravsky Trail.