What do you like doing in your spare time? http://beeghd.in.net/ beeg One of the biggest problems for Orr and his team is thatDetroit is geographically huge given its population of only700,000. It is 139 square miles - big enough to encompassManhattan, Boston and San Francisco combined - and downtownDetroit only represents about 5 percent of that, or roughlyseven square miles.