This map plots the settings and references in Three Men in a Boat

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Page 50. " the busiest lock on the river "
Molesey Lock
Creative Commons AttributionMolesey Lock - Credit: elyob, Flickr

The narrator refers to Molesey lock as Moulsey. Close to Hampton Court, it is the second longest out of forty-five locks on the River Thames and was built between 1814 and 1815.