Sittingbourne is an industrial town in the Swale district, in Kent, southeast England, 17 miles from Canterbury and 45 miles from London, besid…Sittingbourne is an industrial town in the Swale district, in Kent, southeast England, 17 miles from Canterbury and 45 miles from London, beside the Roman Watling Street, an ancient British trackway used by the Romans and the Anglo-Saxons.