peneplain
definition
a low, almost level land surface formed by erosion and sedimentation
example
After millions of years of erosion, the mountain range gradually transformed into a vast peneplain that stretched as far as the eye could see.
synonyms
plainplateaulowland
word origin — The word 'peneplain' is derived from the Latin 'paene,' meaning 'almost,' and 'plain,' which refers to a flat or level surface.