East of the I75-85 connector and including the MLK Jr. Historic district, West of the Beltline and "Railroad Gulch" with a Northeast corner near City Hall East and a Southeast corner near Studioplex at Irwin and Auburn, South to Dekalb Avenue and Decatur Street and North to pretty much North Avenue.
Those dimensions are off the top of my head-google it and check the O4W Neighborhood Association site for sure, because I'm not sure if the Central Park area and the condos and apartments in the "SONO" district along Ralph McGill and up to the Publix shopping center at Piedmont, and up to places like the Krispy Kreme are included.
There's a wikipedia entry that's loaded with details too-look it up!... more