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The Neanderthals are known to have occupied ten sites on the Gibraltar peninsula at the southern tip of Iberia , which may have had one of the densest areas of Neanderthal settlement of anywhere in Europe .
 Gibraltar peninsula
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gibraltar peninsula