Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ocmulgee River (ok-MUHL-gee) is a tributary of the Altamaha River, approximately 255 mi (410 km) long, in the U.S. state of Georgia. Noted for its relatively unspoiled and gentle current, it provides the principal drainage for a large section of the Piedmont and coastal plain of central Georgia.