A meadow
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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.
Belgium is flat
i think its Source
planes
A plain or Grassland
If you are referring to the crossword puzzle hint, the answer is probably prairie.
A plateau
Plain
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a plateau is an area of mostly high, flat land that is raised above nearby land.
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plateau
A Large amount of land with out any trees is known as a "Plain": an area with little or no grass, trees, or inhabitants. PLAIN.
A Savannah, prairie, plain, steppe, or tundra. It depends where you what to describe.