a desert?
A large area of treeless grassland can be a plain, savanna or prairie.
tundra
A treeless zone is called Tundra.
an area of land of mostly flat treeless land
A cold treeless lowland area, permanently frozen, known as Tundra. It supports small shrubs, mosses and grasses
A treeless tract is typically a clearing, if you mean one that is surprising since there are lots of trees around. :) A treeless tract could also be called a steppe, an open area, a field, a desert, a pond... it depends on how flexible you are with your definitions. :)
RainforesT
There are called Tundra
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An eight-letter word for a treeless tract in a forest is a clearing. It could also be called an open area. There are other names, but they do not have eight letters. Of course, if using open area for a crossword puzzle, the space would need to be omitted.
Wetlands are treeless shallow areas usually covered with water. They are transitionally between terrestrial and aquatic ecosystems. They are among the most biologically productive natural ecosystems in the world.
A treeless saddle