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The county lies amidst the Ridge-and-Valley Appalachians , which are characterized by long , narrow ridges , oriented northeast-to-southwest , alternating with similarly-shaped valleys .
 Ridge-and-Valley Appalachians
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ridge-and-Valley Appalachians