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The Yukon Flats are a vast area of wetland s , forest , bog , and low-lying ground centered on the confluence of the Yukon River , Porcupine River , and Chandalar River in the central portion of the U.S. state of Alaska .
 Yukon, Yukon, Alaska
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yukon, Yukon, Alaska