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The canal was opened throughout on 4 June 1777 , with the lock into the River Trent at West Stockwith completed in the autumn , but the only record of wide-beamed boats using it at Retford is prior to 1799 .
 location: River Trent; location: West Stockwith; location: Retford
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: River Trent; location: West Stockwith; location: Retford