The CSX railroad running E-W through Decatur was built on a ridgeline which is along the Eastern Sub-Continental Divide, which runs mostly N-S but happens to run E-W through this area.
A map on a poster board next to the Watershed Mural on DeKalb Ave. at Arizona Ave. (at the southern boundary of Lake Claire) illustrates why some water falling in East Intown Atlanta eventually ends up in the Atlantic Ocean, while some ends up in the Gulf of Mexico.

This page shows a serious attempt to map out the ECD using gps information.
A City of Atlanta page has more details about watersheds inside the perimeter.
Is Atlanta the highest (1000 ft elevation) top 10 metro area on a divide? That will take some research.




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