The Anduin River is the longest river in Middle-earth, a fictional world created by J.R.R. Tolkien. It flows from the Misty Mountains in the north to the Bay of Belfalas in the south, passing through various landscapes, including forests and plains. The river is significant in Tolkien's works, serving as a natural boundary and a vital waterway for characters in stories like "The Lord of the Rings." Throughout its course, the Anduin is associated with important events and locations, such as the Argonath, two massive statues that guard its banks. The river also plays a crucial role in the journey of the Fellowship of the Ring, providing a means of travel and a backdrop for key moments in the narrative.