There are other counties besides Cornwall, Yorkshire, and Essex, but no one can remember what they are.
When you tell people where you're from, they never know where it actually is.
They look at you like you might be making it up.
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As a result, you've developed a shorthand to explain the exact location.
"So it's like, halfway between here and Cornwall? Yeah, sort of near there. Close enough."
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Most people have only ever travelled through it at high speed on a dual carriageway.
Basically, if someone isn't from a neighbouring county, you know they're going to have no idea what you're talking about.
Via giphy.com