The River Journey facility is a 130,000 square foot structure equivalent in height to a twelve-story building. It contains a total of , and was the largest freshwater aquarium in the world when it opened. It is organized around the theme of the Story of the River, following the path of a raindrop from high in the Appalachian Mountains to the Gulf of Mexico. Approximately two-thirds of the facility's display follows this theme, with the rest devoted to smaller aquatic exhibits hosting organisms from around the world.