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Boromir says this article is "So small a thing. Such a little thing!" Please expand it if you can.
Calenhir is a small river located in the realm of Gondor. The river is a tributary of the larger river Morthond. Calenhir originates from Pinnath Gelin, also known as the Green Hills of Gondor, and flows east until it reaches Morthond. It's name seems to mean "Green River" in Sindarin.