The world of Middle-earth that Tolkien created is so intricate and far-reaching that even the most die-hard fans often don't know or remember every piece of the lore. It doesn't help that much of it wasn't actually in the main storyline of the books and can only be found in appendices or in Tolkien's supplementary writing. There are many fans who know The Lord of the Rings inside and out, but who still might not know about various lands and people groups that can be found throughout Middle-earth.