16762
International maritime travel is mainly provided through the Istanbul , from where ferries sail regularly to Varna , Haifa and Ukrferry .
 Istanbul, Varna, Haifa, Ukrferry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Istanbul, Varna, Haifa, Ukrferry