To quote from Ruskie's findings on the Lea family, perhaps a wharf was a general area, like Canary Wharf, and not just a place where
boats cum in 
marriage:
George LEA = Ann Matilda DELL
22 Oct 1842, after Banns
St Pancras Parish Church
George = Batchelor, full age, coal merchant, father: CHARLES LEA dead
address:
Northumberland wharf, Regents Park
Anna Matilda = Full age, spinster, father: William Mostly?? Dell, Gent
address: ?chol House, Havenlook? Hill
witnesses:
Charles Lea and Mary Lea