Treeless region at high latitude is called:

A treeless region at high latitudes is characteristic of the Tundra biome. Tundra environments are defined by extremely cold temperatures, low precipitation, and a very short growing season. A key feature of the arctic tundra is permafrost, a layer of soil that remains permanently frozen, which prevents the establishment of deep-rooted plants like trees. The vegetation in these areas primarily consists of low-growing plants such as mosses, lichens, sedges, grasses, and dwarf shrubs, all adapted to survive the harsh, windy, and cold conditions with limited moisture availability.

• A Desert is characterized by extremely low precipitation and can be hot or cold, but its primary defining feature is aridity, not necessarily high latitude or permafrost that prevents tree growth in the same manner as tundra.
• A Forest is fundamentally defined by the presence of dense tree cover, which is the direct opposite of a treeless region.
• A Grassland is dominated by grasses and typically found in temperate or tropical regions with moderate rainfall, supporting a different type of ecosystem that is distinct from the extreme cold and permafrost conditions of high-latitude treeless regions.