For some reason people in England get really pissed off when it comes to confusion about where they're from. We're naturally very territorial about the area we live, it would seem.
We've all heard a Northerner talking about how rude they've found people during their trip in London. And we've all heard a Southerner talking about how stupid people 'up North' are or how 'over friendly' people are.
So when the BBC tweeted this picture - people went wild. It's like they'd said 'trousers' are actually called 'pants', which they are btw.
A BBC Radio 4 show provoked pretty angry responses on Twitter by seeming to suggest that Manchester and Sheffield are part of the UK's South. Ut ohhhhh.
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They shared the map as part of a discussion between writers and academics over where the North-South border lies.
The unusual suggestion was put forward by Professor Mark Tewdwr-Jones of Newcastle University, whose expertise lie in urban development. He explained his North-South divide is based on accessible transport to the capital.
He said: "The most pertinent question is where does London end? My map is a northern area defined as being 'not London', where London's sphere of influence extends over most of the country - determined by two hour commuting patterns to London which is becoming the norm."
The MailOnline reported that Twitter users were astonished by the map, which suggested cities like Manchester, Leeds and Sheffield lie in the 'South'.
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One man suggested the 'North' is anywhere with an Ikea. While another questioned wherever you say 'tea' or 'dinner' should be considered 'North' and 'South' respectively. Fair point.
Another Twitter user said: "The one they have tweeted is a farce, Sheffield and Manchester two of the most northern cities - northern culture etc".
While a third commented: "Give over! It's easy; what time of day do you eat 'dinner'? #whatsfortea?"
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Someone else added: "This is bonkers. We cannot live in a world where Yorkshire is is not the north nor Manchester. Stop it".
There is no official definition of a North-South border in the UK but everyone has an opinion.