A cartogram is a type of map that that shows certain attributes of geographic aspects as their area. The shape and size of the area is distorted to show the data that it is trying to convey. Any conventional map would would show the size shape and geometry according to its actual land mass. But as you see in the map above, the size and shape is greatly distorted because it is a cartogram according to population density in Great Britain. As you can see, the most populous area is London.