Lol, this is funny.
The accent of where I grew up in Sunderland is called Geordie. Now go about fifty miles south into Yorkshire and you have a completely different accent. Go north by about sixty miles and you are into Scotland which again is completely different. Now I live on the west coast of Scotland, about 170 miles from where I grew up and the accent is almost unintelligible ! We are a small country but the hodge podge of accents we have is truly amazing.
Picking up on what Bill said, even across the different districts of London you have variation !
For me the south of America seems to drawl, where places like Boston have less of an accent.
As for me personally, I don't have much of an accent as I've lived all over the place both in Britain and the continent. When I first moved to London people had huge problems understanding me as I spoke way too fast. By the time I'd slowed my speech down I moved over to the Netherlands, and they had problems with the way I spoke once again ! After being in the Netherlands for a couple of years intended to speak with an Amsterdam accent when I was talking Dutch !