A Savannah, prairie, plain, steppe, or tundra. It depends where you what to describe.
A large flat area of land usually without many trees is called a plain or a prairie. Plains have grasslands and few trees, while prairies are large expanses of flat grassland.
A meadow
a broad area of flat or gently rolling land is called a plain.
a plain
Plateau
Large stretches of very flat land without trees are typically called plains. These areas have low vegetation and are often used for agriculture due to their fertile soil. Examples include the Great Plains in North America and the Eurasian Steppe in Europe and Asia.
Plateau
Plateau
I think this answer is plain.
Plateau
Plateau
Plateau