The Alabama River, in the U.S. state of Alabama, is formed by the Tallapoosa and Coosa rivers, which unite about 6 miles north of Montgomery, near the town of Wetumpka. Over a course of approximately 319 miles, the river meanders west towards Selma, then southwest until, about 45 miles from Mobile, it unites with the Tombigbee, forming th…The Alabama River, in the U.S. state of Alabama, is formed by the Tallapoosa and Coosa rivers, which unite about 6 miles north of Montgomery, near the town of Wetumpka. Over a course of approximately 319 miles, the river meanders west towards Selma, then southwest until, about 45 miles from Mobile, it unites with the Tombigbee, forming the Mobile and Tensaw rivers, which discharge into Mobile Bay.