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Of them , Lake Burgas is the most extensive with 27,6 " km and Lake Varna has the largest volume with 165,5 " million km .
 Lake Burgas, Lake Varna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lake Burgas, Lake Varna