The Digital WorldThe Digital World is an alternate dimension linked to -- what is variously called -- the Human, Analog, or 'Real' World. It is inhabited primarily by Digimon.
I know this may come as quite a surprise to all of you.
When everything is working normally, it experiences a vast time dilation with regards to the human world (with time passing at approxmately at a rate of approximately 100:1). However, the severance of the connection between worlds fifteen years ago has caused a number of disturbances, including pulling the flow of time in line with the human world's.
The BarrensA vast swath of almost wholly lifeless land, characterized by massive cracked canyons, a whole lot of dust and sand, and very few digimon who still live in the vicinity. As of late, the connection to the human world has been strongest here. I'm sure this is fine and will have zero repurcussions. (See: the entire plot.)
The closer you move to the Barrens, the less densely populated the land tends to be.