311973
Distribution The Balkan mixed forests cover much of the valleys , plains and mountain slopes of the eastern Balkans on different altitudes ( except higher parts of the Rhodope and Balkan Mountains , where they are substituted by the Rodope montane mixed forests ) , extend from approximately the Drina valley to the coasts of the Black , Marmara and Aegean Sea s and occupy 224,400 km ² ( 86,600 sq. mi ) in Turkey , Greece , the Republic of Macedonia , Bulgaria , Romania , Serbia ( Kosovo ) .
 Balkans, Turkey, Greece, Republic of Macedonia, Romania, Serbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Balkans, Turkey, Greece, Republic of Macedonia, Romania, Serbia