Balkans
The Balkans are usually said to comprise Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Kosovo, the Republic of Macedonia, Montenegro, Romania, Serbia and Slovenia, while Greece and Turkey are often excluded. Its total area is usually given as 666,700 square km (257,400 square miles) and the population as 59,297,000 (est. 2002).
Balkans Campaign (World War I)
The Balkans Campaign, or Balkan Theatre of World War I was fought between the Central Powers, represented by Austria-Hungary, Bulgaria, Germany and the Ottoman Empire on one side and the Allies, represented by France, Montenegro, Russia, Serbia, and the United Kingdom (and later Romania and Greece, who sided with the Allied Powers) on the other side.