Rostov-on-Don or Rostov-na-Donu is the largest city in the south of Russia, the capital of the Rostov region and the Southern Federal District. It is a major administrative, cultural, scientific, educational, and industrial center and a major transport hub of southern Russia. Informally, Rostov-on-Don is called “the Gate to the Caucasus” and the southern capital of Russia. credit (video): https://www.youtube.com/channel/UCWs09VJjQpRwjGo5CB-l6yg read more: https://russiatrek.org/rostov-on-don-cit