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The reservoir and its environment The reservoir ’s main source of water comes off the Derwent Moors , two km to the west with the Strines Dike and Foulstone Dike rising at a height of around 500 metres above sea level and converging before flowing down to the reservoir which stands at a height of 250 metres .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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