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Bull Run Mountains Natural Area Preserve is a Natural Area Preserve located along the Bull Run Mountains in Fauquier and Prince William Counties , Virginia .
 Fauquier, Prince William Counties , Virginia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fauquier, Prince William Counties , Virginia