A prehistoric valley hidden by mountains, lost to time
The Dawn Land it’s a valley hidden by the mountains known as the Barriers of the Moon which was lost to time. A place full of prehistoric animals, Army Men ivory poachers, headhunters, Hairy Men, mythological Amazon women, among others.
This hidden valley have 3 different Portals, one connected to the Real World, the other to the Prehistoric World or the Plastic World (depending what Dawn Land version is). The other one was inactive and it’s unknown how to make it work (maybe needs a key like Santa Plastico’s Portal). The Hairy Men, a group of Neanderthals who lived there, are from an unknown origin. So maybe they came from that portal, maybe a cave men prehistoric themed world.
Contamination
These portals are probably what produced the contamination of other worlds. But luckily, being a sealed place, this prevented the contamination from spreading further there. At the same time, this place has its native protectors who prevent the external from interfering with the valley.
Mirror places
Plastic World’s Dawn Land is an almost exact copy, a mirror, of a place of the same name, but in the Prehistoric World, or vice versa. Upon entering this place from the respective portal, the user arrive at an almost identical place, as if it were the same place, but with the original statues like new in the Prehistoric World and with the statues old, rusty and broken in the Plastic World, like if years passed.
This raises the question: Are the other worlds a version of the Plastic World, but from another time?, or in this case are they simply imitations of the same places?. Or are they like those tables of human modelers who made miniatures of their world? Is the Toyverse then a product of human modeling? Well, in some way, maybe…
Explorers have said that by taking this reference point, and heading to known places at certain coordinates from there, you can find ancient versions of the well known Plastic World locations, as if an Army Men base or city had never existed there. But this enters, for now, into the realm of mere speculation.
Cave Girl & Luke Hardin, valley protectors
A particular Plastic Woman lives in the Dawn Land, both Prehistoric & Plastic World versions, named Cave Girl. She manages to escape death when an eagle carried her away, who drops the girl there. She was breed by Wolves. Hairy Men king, Pood, wanted Cave Girl for himself, but she did not want anything to do with him and fought back slaying the Hairy Men. Later, explorer Luke Hardin enter the valley and became her boyfriend. Both protect this place from external interferences, both versions (Plastic & Prehistoric worlds).
Sources for this article:
https://comicvine.gamespot.com/cave-girl/4005-25401/
https://pdsh.fandom.com/wiki/Cave_Girl