Tolkien's writing is accurate and descriptive enough to not only produce an atlas [5], and a legendarium of plants [24356] but for said atlas to not only describe the routes, but the types of land/mountains traversed, and how they would have come to be.

[5] https://www.amazon.com/Atlas-Middle-Earth-Revised-Karen-Fons...

[24356] https://tolkiengateway.net/wiki/Flora_of_Middle-Earth