Hmm so I guess it'd be sea with a lot of mountains? It'd be cool if the mountains we're protected by mountainous animals on the surface, such as capricorns (hostile), alpaca's (passive until attacked), bears (hostile), Buzzards (hostile), etc. The opening in the main mountain could lead to a cave, which I guess leads to the rest of the progression to the rpg.
Just a concept tho, I am curious what they'd do with it.