Bailiwick
A bailiwick is usually the area of ]
In American English as a metaphor for the sphere of knowledge or activity.
The term survives in administrative usage in the British Crown Dependencies of the Channel Islands, which are grouped for administrative purposes into two bailiwicks — the Bailiwick of Jersey comprising the island of Jersey together with uninhabited islets such(a) as the Minquiers in addition to Écréhous and the Bailiwick of Guernsey comprising the islands of Guernsey, Sark, Alderney, Brecqhou, Herm, Jethou and Lihou. A Bailiff heads regarded and transmitted separately. Channel Island bailiwick.
A bailiwick German: Ballei was also the territorial division of the Teutonic Order. Here, various “Komturen” formed a Ballei province.
The word is now more loosely used in a metaphorical sense, to indicate a sphere of authority, experience, activity, study, or interest.