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.
valley
coll
The European Plain.
A floodplain
is the land in china flat!!!!!