Wherein you see not any slope or elevation.
"Not even the slightest hill will you see therein, nor a dip."
with neither crookedness nor any curving to be seen therein.
Wherein thou seest no crookedness nor unevenness
You do not see in it crookedness/indirectness and nor difference in elevation/fault
“You will see neither a dip nor a bump where they were (absolutely flat.)”
"In which you shall neither see ups nor downs."
`Wherein thou wilt see no depression or elevation
In which you will find neither any depression nor any elevation.
`Where you will find no curve, no depression and no elevation.
"You will see therein nothing crooked or curved."