Still, a really detailed map - for a bunch of supposed primative people in 12,000 BC - to make without any access to an overhead view, or surveying equip. or GPS. Just how did they make the representations accurate enough for them to follow? These are not simple scrachings on a rock wall. Simple scratchings would not be made like a modern relief map, which that one is, certainly not by a people who say “Ugh” a lot.
To paraphrase:
The deep past is not only stranger than we know, it is stranger that we can imagine.
The first thing that came to my mind was to wonder if the permanent features (e.g. hills) resembled anything in the immediate area, or if the features are too general and could resemble just about anything. Rivers would likely have moved over this period of time, and flora obviously would not be a guide for anything there today.