A meadow
planes
If you are referring to the crossword puzzle hint, the answer is probably prairie.
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.
A large area of treeless grassland can be a plain, savanna or prairie.
A meadow
planes
A flat area of land with few trees is typically called a plain or grassland. Plains are characterized by their low elevation, gently rolling hills, and lack of significant vegetation, while grasslands are dominated by grasses with scattered trees or shrubs.
If you are referring to the crossword puzzle hint, the answer is probably prairie.
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.
That type of land is commonly known as a prairie or a grassland. It is characterized by its open and expansive terrain with minimal tree coverage.
A plateau
A wide mostly flat area with very few trees is called a grassland or a prairie. These areas are characterized by vast expanses of open grasses with minimal tree cover. Examples include the Great Plains in North America and the savannas of Africa.
a plateau is an area of mostly high, flat land that is raised above nearby land.
plateau
A Savannah, prairie, plain, steppe, or tundra. It depends where you what to describe.
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.