Flat lands are also called plains in general.
Plains or prairie
It would be a plain or a quagmire
TeNnes
the high flat land is called " plateau".
The Ohio Divide.
A large, flat area of land is called a plain.
waste land
Flat open land is called a plain. A plain is a flat area with few trees. They can occur as lowlands and at the bottom of valleys, but can also be on plateaus or uplands at high elevations.
junk
yes it is flat land hehe
TeNnes
Field.
plane
The great plains are a flat area of land in the center of N.America.
The flat open land between two great mountain ranges is called a valley. Valleys are often formed by the erosion of rivers and glaciers over time, creating a low-lying area surrounded by mountains on either side.
coll
The European Plain.
A floodplain
is the land in china flat!!!!!