The document discusses tundra, describing it as a treeless, frozen landscape found in very cold places like Greenland, Sweden, and Alaska. It notes there are two types, Arctic and Alpine tundra, with Arctic tundra being the coldest and most widespread without trees due to its high latitude. Alpine tundra lacks trees due to high elevation. Some animals that live in tundra regions mentioned include musk ox, arctic hare, and arctic fox.