It's interesting that the ECD passes through several communities that probably don't know that they are on the ECD.  For example, it also passes through Lovejoy, Decatur, Tucker, Norcross. Hog Mountain (with a name like that, it needs something to promote it!), Blackshear, Chicopee, a cemetery on the Gainesville Airport, Lula (another unique Georgia name), Alto (where the naughty kids are incarcerated), and Turnerville.

A accurate trace of the complete Ocmulgee/Chattahoochee River ECD divide from Underground Atlanta eastward shows it follows the Georgia Railroad until that hits Mountain Industrial Blvd.  Then it follows that northward until it veers off into the city of Tucker and goes right through the Hugh Howell Lawrence Hwy. split.

Then northward along Chamblee-Tucker Rd. to the S. Norcross-Tucker/Pleantdale split.  And then along S. Norcross-Tucker Rd. to Jimmy Carter Blvd., across I-85, and through the center of Norcross along N. Peachtree St. -which turns into Medlock Bridge Rd.

Then across Peachtree Ind. Blvd. to Old Peachtree Rd. until it finally links up with the Southern RR near Berkeley Lake, which it follows for a good ways north-eastward.