9181
The area is a major waterfowl breeding ground , and after a proposal to flood the Yukon Flats via a dam on the Yukon River was turned down , the Yukon Flats were deemed worthy of protection .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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