Right Up Gotham's Alley

This map appeared in this week's Detective Comics #40:

Wow. That's one hell of an alley...

Yes, yes, I know--"Crime Alley" could refer to an entire neighborhood, not just one particular alley. A pretty big neighborhood, by the looks of that map...

Or maybe this is proof of The Busiek Hypothesis--DC Earth is bigger than our Earth, in order to accommodate all those extra cities. Obviously, not only is the planet bigger, but the alleys are, as well...