The canyon wall is slanted- the outside bay border matches that, but everything else is vertical. It makes sense if you're moving around in the map, even if it looks odd in screenshots.
Edit: Here's a side view of the bay, both textured and wireframe:
As you can see, everything except right where the canyon wall meets the bay is perfectly vertical. The only way not to have that border match the wall would be to extend the ceiling of the bay out a little, which would look strange and ugly.










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