u/Fendeerisr-Elvish

Does anyone know why I have this randomly appearing on my map? This isn't the first time I've seen it either. I know that fiery-ness and coloring usually indicates Superior or better animals or plants (or Mature animals) in the world but on the map? I'm thinking it's a map visual glitch, but figured I'd ask anyway. I didn't go over to explore it or anything as of this post