These maps were generated using programs, so there's no room for human error - thus, they're "perfect to the pixel".

Silvest

Overworld

Underworld

Combined view

Note that the Silvest exit cave is somewhat misaligned - I believe that is because it was impossible to align them anyway due to the different entry/exit positions in the map chunks.

Krythan

Overworld

Underworld

Combined view

Not all caves have been thoroughly discovered; for example, the cavern under Hothbra is only fully accessible to those doing the guild books quest. As far as we can tell, the parts of other caverns visible are inaccessible at the moment.

World map

Overworld

Underworld

Combined view

The underground map is not complete, but is still quite comprehensive.