Region of southeast Europe, between the Adriatic and Aegean seas, mostly coextensive with the Balkan Peninsula
  • Albania - Territory in southeast Europe on the Adriatic Sea, ruled since 1992 by the Republika e Shqipërisë
  • Bosnia and Herzegovina - Territory in south central Europe, ruled since 1995 by Republika Srpska, the Federacija Bosne i Hercegovine and the Brčko Distrikt
  • Bulgaria - Territory in southeast Europe, ruled since 1991 by the Republic of Bulgaria
  • Croatia - Territory in southern Europe, ruled since 1991 by the Republika Hrvatska
  • Greece - Territory in southeast Europe, ruled since 1975 by the Elliniki Dhimokratia
  • Kosovo - Territory in southeastern Europe, nominally ruled since 2008 by the Republika e Kosovës, but also claimed by the Republika Srbija
  • Macedonia, Republic of - Territory in southeast Europe, ruled since 1991 by the Republika Makedonija
  • Montenegro - Territory in the western Balkan Peninsula, ruled since 2006 by the Crna Gora
  • Romania - Territory in southeast Europe, ruled since 1991 by the Statul Român
  • Serbia - Territory in southeastern Europe, ruled since 2006 by the Republika Srbija
  • Slovenia - Territory in central Europe, ruled since 1991 by the Republika Slovenija
  • Turkey - Territory in southwest Asia and southeast Europe, ruled since 1923 by the Türkiye Cumhuriyeti