The South River originates underground in Fulton County. As it rises to the surface it flows through DeKalb County, becoming a vital part of their water system. It continues to flow southeastward, eventually emptying into Lake Jackson along the Jasper/Newton County border. There it meets with the Alcovy River and Yellow River to form the Ocmulgee River, which flows southward, then eastward to converge with the Oconee River to form Georgia’s largest river - the Altamaha River. The Altamaha River flows eastward into the Atlantic Ocean.