60675
Other origins of the name have been suggested , including " elverpool " , a reference to the large number of eels in the Mersey while another such suggestion is derivation from Welsh , apparently meaning " expanse or confluence at the pool " .
 Mersey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mersey