Original: Rostov-on-Don ( Rostov-na-Donu, ) is the city and the administrative center of Rostov Oblast and the Southern Federal District of Russia, located on the Don River, just 46 km from the Sea of Azov.
Simplified: It is located on the River Don, about 46 km before it flows into the Sea of Azov. The city is the administrative center of Rostov Oblast and the Southern Federal District of Russia.