Tundras are arctic plains that are dominated by sedge, heath, willow, and lichen.
They are found in most of the earth's northern terrain. Another type of tundra is the alpine tundra. This type of tundra occurs above the timberline in the high mountains of the world. The Antarctic has a few areas of tundra as well. Tundra has a distribution throughout the northern hemisphere, but in the southern hemisphere it is only found on the Antarctic Peninsula and surrounding islands.