Russia: The Largest Tundra LandmassRussia is by far the most expansive country covered by the tundra biome, stretching across northern Siberia. Canada: A Major Arctic FrontierCanada’s northern territories, including Yukon, Northwest Territories, and Nunavut, encompass significant portions of the Arctic tundra. Surrounding this ice sheet are tundra regions punctuated by rocky outcroppings and limited vegetation. The Impact of Climate Change on Tundra TerritoriesAcross all these regions, the tundra faces unprecedented threats from climate change. As the Arctic continues to warm faster than other parts of the world, the countries covered by the tundra are at the frontline of environmental change.