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The park also protects the headwaters of the Fuji River , Ōi River and Tenryū River .
 Fuji River, Ōi River, Tenryū River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fuji River, Ōi River, Tenryū River