It looks like you're working on a draft title or chapter heading that blends a few iconic Tolkien elements. "The Shadow of the Past" is actually the title of of The Fellowship of the Ring , where Gandalf explains the true nature of the Ring to Frodo.
There is a popular YA fantasy book titled Sea of Shadows by Kelley Armstrong. If you were searching for that specifically, it isn't related to Tolkien's universe, though the titles are very similar! A Shadow of the PastThe Lord of the Rings : Sea...
Are you writing a about Mordor, or were you looking for a specific chapter or game level ? LotR Reread: The Shadow of the Past - Stewartry It looks like you're working on a draft
It features prominently in the video game Middle-earth: Shadow of Mordor , making it a popular choice for fan projects or new stories set in that era. 2. The Sea of Rhûn (The East) If you were searching for that specifically, it
If you're writing about a dark or "shadowy" location, this is a top candidate. It's a bitter, inland sea in southern Mordor where Sauron kept slaves to farm crops for his armies.
The second part of your draft, "The Lord of the Rings: Sea...", could refer to a few different things in Middle-earth: 1. The Sea of Núrnen (Mordor)