"The earth with her bars" is how Jonah described the pillars of the earth when he was in the belly of hell, possibly in the place which we refer to as Abraham's bosom. Jesus also went here after the crucifixion.
The Earth with Her Bars
The Bars of the Pit
"The bars of the pit" is a synonym for "the pillars of the earth." They're in the great gulf or "mega chasm" which is the region of Earth's interior which popular science (SciPop) calls the "liquid outer core."