Lyric discussion by rash_powder 

Led Zeppelin were fans of the author of the Lord of the Rings series, JRR Tolkein. This song, as well as several others, has many allusions to events in the series of books Tolkein wrote. This one in particular alludes to events from The Simarillan, which is the elves' history. If you read the book and then listen to the song, you will understand.

isn't the simarilian a forest anyway?

This songs was writen in the 70s. If Lord of the Rings was written then, no one knew about it.

oroboknown: The Silmarillion is the elves' tale of how the three Silmarils -- Their race's most precious jewels -- were created, fought over, and lost.

Floddead: The final installment in The Lord of the Rings, "The Return of the King," was published in 1955, and Tolkien had Tolkien had been working on the trilogy since the '30s.

I think this song is about "The Voyage of Earendil."If you are unfamiliar with the story you can look it up on the internet and read it relatively quickly.

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