21553
Areas such as Albania , western Macedonia , southern Serbia , Kosovo , parts of northern Greece and southern Montenegro in Ottoman sources were referred to as " Arnavudluk " or Albania .
 Albania, Macedonia, Serbia, Kosovo, Greece, Montenegro, Ottoman, Albania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Albania, Macedonia, Serbia, Kosovo, Greece, Montenegro, Ottoman, Albania