The Cahaba River is the longest substantially free-flowing river in Alabama. It is a major tributary of the Alabama River and part of the larger Mobile River basin. With headwaters near Birmingham, the Cahaba flows southwest, then at Heiberger turns southeast and joins the Alabama River at the ghost town and former Alabama capital of Cahaba in Dallas Co…The Cahaba River is the longest substantially free-flowing river in Alabama. It is a major tributary of the Alabama River and part of the larger Mobile River basin. With headwaters near Birmingham, the Cahaba flows southwest, then at Heiberger turns southeast and joins the Alabama River at the ghost town and former Alabama capital of Cahaba in Dallas County. Entirely within central Alabama, the Cahaba River is 194 miles long and drains an area of 1,870 square miles. The name Cahaba is derived from the Choctaw words oka meaning "water" and aba meaning "above"
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