"It shows what Blackwell’s called “the exacting nature” of Tolkien’s creative vision: he corrects place names, provides extra ones, and gives Baynes a host of suggestions about the map’s various flora and fauna." You've got to respect the man for his attention to detail. To the outsider it might seem as if it were near insanity levels (fully creating multiple language families for instance https://en.wikipedia.org/wi…
https://www.youtube.com/watch?v=mA6MQHNM2yE
I don't fully agree with the thesis of the video, but it's a worthy watch and well reasoned argument.