Balkan States The countries of the Balkan Peninsula, including Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Kosovo, Macedonia, Montenegro, and Serbia, along with areas of continental Greece, southeast Romania, and European Turkey.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Balkan States pl n (Placename) the countries of the Balkan Peninsula: the former Yugoslavian Republics, Romania, Bulgaria, Albania, Greece, and the European part of Turkey. Also called: the Balkans Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014