State of Alabama v. State of Georgia, 64 U.S. (23 How.) 505 (1860), is a 9-to-0 ruling by the Supreme Court of the United States which held that the true border between the states of Alabama and Georgia was the average water mark on the western bank of the Chattahoochee River. In coming to its conclusion, the Court defined what constituted the bed and bank of a river. The case has had international repercussions as well. The Supreme Court's definition was adopted by courts in the United Kingdom in the case (1896) 65 LJ Ch. 515, 2 Ch. 27.