In J. R. R. Tolkien's fictional universe of Middle-earth, the river Lhûn or Lune was a river of north-western Eriador.In the Second and Third Age, it emptied into the Gulf of Lune that broke through the Ered Luin and thence into Belegaer.
It had three (unnamed) tributaries: two of them arising in the Ered Luin, and one beginning in the Hills of Evendim north of the later capital of Arnor, Annúminas. It was not connected to Lake Nenuial, the origin of the Baranduin (Brandywine) river.
In the First Age, the course of the river is not known. The Gulf of Lune was not created until the War of WrathIn the fiction of J. Tolkien, the War of Wrath or the Great Battle was the final war against Morgoth at the end of the First Age. 500 years into the First Age, Morgoth had become mighty in Middle-earth, not least because of the strife among the Noldor. so the river must have had a different lower course. Possibly it connected with the Baranduin further south.
Middle-earth rivers
