a vast treeless plain in the Arctic regions where the subsoil is permanently frozen
"The reindeer herders struggled to find enough lichen on the barren tundra, where the ground remained locked beneath a layer of permafrost."
A flat and treeless Arctic biome.
"The reindeer herd migrated across the vast, frozen tundra where no trees grew to block their path."
The word "tundra" comes from the Russian word túndra, which was borrowed from Kildin Sami. In its original language, it referred to a specific type of barren landscape.