Perfume Harbour is a raft city that sails the oceans. Though it does not appear directly during the main series, it is occasionally referred to. The city is oriental in origin; it may be based on Hong Kong, whose name translates to "fragrant harbour".
When Orla Twombley was working on the Cygnet Committee, the Green Storm attacked them above Perfume Harbour. However, Orla Twombley wipe out the Greenstorm attack ships in the Combat Wombat.
Perfume Harbour appeared in the opening of the Mortal Engines comic The Haunted Sky. Anna Fang and other aviators from around the world are gathering there for an airship race.