Reindeer live in a wide range of habitats, but the most common place to find them is in the Arctic tundra. The tundra is a vast area of frozen land that covers much of the northern hemisphere, including parts of Russia, Canada, and Greenland. Reindeer are well-adapted to life in this cold and snowy environment, and they can survive in temperatures as low as -50 degrees Celsius. They are also excellent swimmers, and they can use their hooves to dig through the snow to find food during the winter months.