The geographical region characterized by vast tundra is the Arctic. This cold, treeless ecosystem supports unique flora and fauna specially adapted to harsh conditions. Tundra is prevalent in areas such as northern Canada, Alaska, and parts of Russia. Its permafrost layer influences the landscape, limiting vegetation growth. The Arctic tundra is crucial for ecological balance and climate studies, acting as an important indicator of climate change impacts due to its sensitivity to temperature fluctuations and melting ice.