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Federal scientists estimate that between 16,000 and 21,000 US gallons ( 61 to 79 m ) of oil remains on beaches in Prince William Sound and up to 450 miles ( 725 " km ) away .
 Prince William Sound
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Prince William Sound