Southeast Europe or Southeastern Europe is a geographical region of Europe, consisting primarily of the Balkans. Sovereign states and territories that are included in the region are, in alphabetical order: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Greece, Kosovo, Montenegro, North Macedonia, Romania, Serbia, and Turkey. Sometimes, Moldova and Slovenia are also included. The largest city of the region is Istanbul, followed by Bucharest, Sofia, Belgrade, and Athens.
There are overlapping and conflicting definitions of the region, due to political, economic, historical, cultural, and geographical considerations.