It is called a plain.
The flattest land form is called a plain. It is a broad, relatively flat area of land characterized by minimal elevation changes and typically lacks significant geological formations such as mountains or hills. Plains are often found in coastal regions or in interior areas that have been shaped by erosion or by the deposition of sediment over time.
Mesa .
Roughest.
lava plateau
land slides form when the ground gets too soft from water (ex. rain.)
Delta
plain
in bradferd
flattest
I can give you several sentences.This is the flattest land I've ever seen.You need to see who can make the flattest piece of paper in art class.I think that must be the flattest tire in the world.
Coastal Plain
No;it is just the flattest.
rock bottom
Middle Tennessee
Yes. The adjective "flattest" is the superlative form of the adjective flat. The comparative form also doubles the final T (flatter) which is the same spelling as the verb flatter.
Flattest.
The southern coast along the Gulf of Ghana and around Lake Volta
flatter/flattest