See the Sketches J.R.R. Tolkien Used to Build Middle-Earth

HOW DID J.R.R. Tolkien create The Lord of the Rings? The simple answer is that he wrote it. He sat down in a chair in 1937 and spent more than a dozen years working on what remains a masterwork of fantasy literature and a genius stroke of immersive worldbuilding. The more complicated answer is that in addition to writing the story, he drew it. The many maps and sketches he made while drafting The Lord of the Rings informed his storytelling, allowing him to test narrative ideas and illustrate scenes he needed to capture in words. For Tolkien, the art of writing and the art of drawing were inextricably intertwined.
Read more: https://www.wired.com/2015/10/see-jrr-tolkien-lord-of-the-rings-middle-earth-illustrations-for-first-time/?source=Snapzu