The Mountains of Despair is the last leg of your journey in the Logical Journey of the Zoombinis. It is composed of three puzzles:
The region is named for the depression that is caused the many Zoombinis that were repeatedly lost in the region - it being one of the most dangerous regions of the trip.
This is a mountainous region. The safest way to travel through it would be in the mountains themselves. Zoombiniville is surrounded by many hills. And is a grassy region.
There are bats that live here. A long time ago there used to live an ancient civilization that became extinct but left archaeology.