Slavo-Serbia (Ukrainian: Слов’яносе́рбія; Russian: Славяносербия or Slavyanoserbiya; Serbian: Славеносрбија or Slavenosrbija; archaic Serbian name: Славено-Сербія) was a territory of Imperial Russia between 1753 and 1764. It was located by the right bank of the Donets River between the Bakhmut (Бахмут) and Luhan (Лугань) rivers. This area today constitutes the territories of present-day Luhansk Oblast and Donetsk Oblast of Ukraine. The administrative centre of Slavo-Serbia was Bakhmut (Bahmut).
Read more about Slavo-Serbia: History, Demographics, Places of Slavo-Serbia