It is well known that J.R.R. Tolkien published The Hobbit in 1937 and The Lord of the Rings in 1954-5. What may be less known is that he continued to write about Middle-earth in the decades that followed, right up until the years before his death in 1973. For him, Middle-earth was part of an entire world to be explored, and the writings in The Nature of Middle-earth reveal the journeys that he took as he sought to better understand his unique creation. He discusses sweeping themes as profound as Elvish immortality and reincarnation, and the Powers of the Valar, to the more earth-bound subjects of the lands and beasts of Númenor and the geography of the Rivers and Beacon-hills of Gondor.