That other part of the map is the 3D skybox. It is created at 1/16 scale of the rest of the map, and is used purely for cosmetic purposes. When you are standing inside of the actual map and look up in the sky, you will see that same image around in the sky.
For example: imagine that the black square missing in the 3D skybox is the playable area of the map itself. While the mountains are surrounding it, you cannot actually go there, but merely just see them.
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