The river Glanduin (Sindarin for Border-river), is a river in eastern Eriador.
The Glanduin cascades directly from the peaks of the Misty Mountains in the southern part of Eregion, forming a natural border to Enedwaith to the south. The river then courses west past Mirobel and Caras Gelebren, running through Swanfleet where it forms the great delta of the Wadewater together with several smaller streams pouring in from the Stoor-vales. At the west end of the Wadewater, the Glanduin flows together with the Hoarwell coming in from the north. These two rivers merge and become the great Gwathló river, which passes Tharbad and heads south, at last emptying into the ocean by the ancient port city of Lond Daer.
The Glanduin flows west from the Misty Mountains through southern Eregion.
Its name meaning Border-river, it separates Eregion from Enedwaith through its eastern course.
In Munudh Cadlus, Dunlendings and half-orcs have set up a barricaded camp which opens up to the river.
The holly trees of Eregion line the banks of the Glanduin as it continues west past Ulundín.
The Angmarim have set up camp near Tham Mírdain, looking for ancient ringlore.
The ancient elven jeweltown of Mirobel lies just north of the banks of the Glanduin.
Further downriver, an elaborate bridge crosses the Glanduin to the Library at Tham Mírdain.
The Glanduin passes into the Swanfleet area, itself an important contributor to the wetlands located there.
A second bridge leads across to Caras Gelebren, the ancient city of Celebrimbor's forgesmiths.
Beyond the fallen city, the Glanduin splits into two, and then three streams, losing much speed and depth. Thus, the Wadewater is formed.
As the Glanduin meets the Mitheithel just outside the toppled walls of Nimbarth, they join together into one great flow - the Gwathló.