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The third area is eastern Bosnia , around the river Drina between the towns of Foča and Zvornik , the principal mining activity centered around Srebrenica .
 Bosnia, Drina, Foča, Zvornik, Srebrenica
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bosnia, Drina, Foča, Zvornik, Srebrenica