Esgalduin

Esgalduin was a major tributary of the Sirion, which rose in the dark heights of the Ered Gorgoroth from the Shadowy Spring, and flowed southwestward to meet the Sirion on the western borders of Doriath. It marked the boundary between the forests of Neldoreth and Region.
Etymology
In a manuscript dating from the late 1950s and early 1960s, Tolkien wrote that Esgalduin is a Sindarin name meaning "the river under shade".
In the earlier Etymologies, the name Esgalduin was said to be Ilkorin for "River under Veil (of [?leaves])", consisting of the elements esgal ("screen, hiding, roof of leaves") + duin ("water, river").
Referencias
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