Brillig

Alice had one adventure by falling down a rabbit hole. She then went on another by walking through a mirror. Were they the same place? Or two entirely distinct ones? Adaptations tend to smash characters and events from both books into one gestalt. But there are also sources that explain something called Looking-Glass Land. 

I'm not looking to settle this argument or even enter into it. Just pointing out that there's a reason for the ambiguity. Carroll knew it didn't matter. The word "worldbuilding" hadn't been coined yet. The idea that his fantasylands had to have consistent backstories would have been laughable to him. As it would be to most writers and readers of his time. 

RETVRN