Altamaha River Frangiamore, Christa S. Gibbons, Whit Altamaha River (Ga.) Rivers--Georgia Encyclopedia article about the Altamaha River. The third largest contributor of freshwater to the Atlantic Ocean on North America's eastern shore, the Altamaha River basin lies entirely within the state of Georgia. The Altamaha River, formed by the confluence of the Ocmulgee and Oconee rivers near Lumber City and joined farther downstream by the Ohoopee River, flows more than 130 straight-line miles from its northernmost points to its entry into the Atlantic Ocean north of Brunswick. The Altamaha River basin drains nearly one quarter of the state of Georgia, with its 14,000-square-mile watershed reaching from the upper Piedmont to the Lower Coastal Plain and encompassing the cities of Athens, Macon, Milledgeville, and parts of Atlanta. [Athens, Ga.] : Georgia Humanities Council and the University of Georgia Press New Georgia Encyclopedia (Project) Georgia Humanities Council University of Georgia. Press Merrill-Hall New Media GALILEO (Georgia statewide project) 2004-08-09 Articles http://www.georgiaencyclopedia.org/nge/Article.jsp?id=h-2834 Forms part of the New Georgia Encyclopedia. If you wish to use content from the NGE site for commercial use, publication, or any purpose other than fair use as defined by law, you must request and receive written permission from the NGE. Such requests may be directed to: Permissions/NGE, University of Georgia Press, 330 Research Drive, Athens, GA 30602. Cite as: "Altamaha River," New Georgia Encyclopedia. Retrieved [date]: http://www.georgiaencyclopedia.org.