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It is locally believed that the word ' Ganga ' the name of holy river of Hindu , originating from gomukh ( mouth of cow ) as Bhagirathi river and passing through Haridwar , Allahabad and finally to Bay of Bengal , originated from the river called ' Gonkha ' which in Tibet means ' mouth of cow ' .
 Tibet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tibet