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Global Range: (250-5000 square km (about 100-2000 square miles)) The historical range of the Altamaha spinymussel was restricted to the Coastal Plain portion of the Altamaha River and the lower portions of its three major tributaries, the Ohoopee, Ocmulgee, and Oconee rivers. The Altamaha River is formed by the confluence of the Ocmulgee and Oconee rivers and lies entirely within the State of Georgia. It is now restricted to the middle and upper (coastal plain portion) Altamaha River, the lower Ocmulgee River, lower Oconee River and the lower Ohoopee River (USFWS, 2002; 2003; 2005). All these rivers are in the Altamaha River Basin in Georgia.