The geographical feature of Northern Canada characterized by tundra is called the Arctic tundra. This biome is characterized by its cold climate, low precipitation, and permafrost layer, which limits plant growth to low shrubs and mosses. The tundra supports unique wildlife adapted to harsh conditions, including polar bears, caribou, and various migratory birds. This ecosystem plays a crucial role in global climate regulation and serves as an important area for research on climate change effects.