What I can remember was that this was an OLD sci-fi/fantasy movie (I think I remember it being in 3D) and it had a female protagonist with some sort of tribal paint/tattooing on her. She did the typical restless and adventurous female character-shtick.
Anyway, she was super curious about the other side of the planet, but for whatever reason she never got there until much later in the movie. I do remember that she was shocked that the planet stopped and she nearly fell off the bottom which was made up of roots. All roots at the bottom.
And…well, that’s what I remember.
It wasn't a great movie, from what I remember, but I'm still super interested in re-watching it.