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After the peaceful reintegration , two Croatian islands on the Danube , the Island of Šarengrad and the Island of Vukovar , remained under Serbian military control .
 Danube, Island of Šarengrad, Island of Vukovar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Danube, Island of Šarengrad, Island of Vukovar