A treeless zone is called Tundra.
The prairie or great plains. In Africa it is called the Savannah or veld.
The treeless zone between the ice cap and North America is known as the tundra. It is characterized by cold temperatures, short growing seasons, and low-growing vegetation such as grasses, mosses, and lichens. The tundra is found in northern regions of North America, Europe, and Asia.
A treeless saddle
a desert?
A cold treeless lowland area, permanently frozen, known as Tundra. It supports small shrubs, mosses and grasses
Llano
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The grasslands in the Us are called "the Great Plains."
Tundra
Tundra
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A large area of treeless grassland can be a plain, savanna or prairie.