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This claim is based on , the scale of the ruins , the fact that the local name for the ruins is Naysān which is probably a corruption of the Parthian name Maysān and it being located at the confluence of the Tigris and Karkheh River s as stated of Charax Spasinu , by Pliny the Elder .
 Pliny the Elder
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pliny the Elder