As far as I know, there is no real way to get from London to Berlin by car - at least, not without resorting to the tunneltrain, or the ferry.
;-) But that isn't sooo important.
But yeah, 600 miles is, maybe, a little too big. I figured that while scaling my map - I came to realize that every mm was three miles! Here's to marking cities on the map...
Edit: On the other hand, if each region is 440 n/s and between 220-385 e/w... it sounds more plausible. But then again, we have squares, with actually odd lengths.
So either we start handing out trapezes, knock off any scales, or just mutually agree on 440m n/s&e/w... (I guess...)