Tundra is the name for a broad plain that exists in a polar area. Words that are related to tundra are wasteland, expanse, plateau, and flatland.
The answer is a plain.
I believe it is PLAIN
Plain
A plateau is a broad and flat or gently rolling area where there are few changes in the landscape.
A coastal plain is a broad level area of land that is close to sea level. Coastal plains are formed by the accumulation of sediments from rivers and coastal processes, resulting in a flat and low-lying landscape that stretches along the coastline.
A plain
Serengeti plain
Serengeti Plain
Serengeti Plain
Serengeti Plain
Serengeti Plain
The serengeti plain