Plain.
A flat or gently rolling low land is called a plateau.
Plain??
A mud flat
In geography, a plain is land with relatively low relief, that is flat or gently rolling. Prairies and steppes are types of plains
Low lying area with large stretches of land
Plain.
it has flat land and low
Plain
A plain is a landform of flat or gently rolling land with low relief. It is one of the Earth's major landforms.
plain
žThe land is mainly flat and low-lying in Manaus. There are a few hills and low mountain range.
Vast, flat, grassy.
A flat or gently rolling low land is called a plateau.
plain
Valley
Appalachian mountains