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The Poros joins this river shortly before it flows into the sea at a delta known as the "Ethir." The city of Framsburg, which was named after a ruler who slew Scatha, lies near the site where this river is formed by the confluence of the Greylin and the Langwell. The island of (*) Carrock rises from a "swirling channel" in this river, which later flows between two massive sculptures known as the Gates of Argonath. Its name is derived from Sindarin words meaning "Great River." A lament for a warrior who died "Beneath Amon Hen" claims that the "Tower of Guard" shall "ever northward gaze" to the "golden" falls of Rauros on this river. ►  Boromir's body is placed on a boat that travels down, for 10 points, what major river of Middle Earth? 
The Poros joins this river shortly before it flows into the sea at a delta known as the "Ethir."
Anduin (accept Langflood; prompt on "Great River (of Wilderland)")