system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How closely do the borders of Magical Britain match those of Muggle Britain?

Is everything in the United Kingdom considered part of Magical Britain (Northern Ireland and the British Overseas Territories), or is it only the island of Great Britain that marks the border?

How about other countries?  Do the Magical and Muggle borders line up, or do they differ?  When one changes their borders, does it effect the other?  And how much of a role do the wizards play when it comes to war or other forms of territory acquisition (like the Louisiana Purchase)
gpt
Based on the presence of Seamus Finnegan and the fact that during the Quidditch world cup many British fans (among them the Weasleys) considered supporting Ireland nearly as good as supporting England or Scotland, it's entirely possible that wizarding Britain includes not just Northern Ireland, but *all* of Ireland.