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The county contains a number of prominent geographical features , most notably the Mesilla Valley ( the flood plain of the Rio Grande ) going north to south through the center and the Organ Mountains along the county 's eastern edge .
 Mesilla, Organ
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mesilla, Organ