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Beginning at an elevation of in central Owyhee County , Idaho , it flows generally south to its mouth west of Riddle , at an elevation of .
 Owyhee County , Idaho, Riddle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Owyhee County , Idaho, Riddle