The largest volumes of ice on land are called ice sheets. The area has to be over 50 thousand km² before you can call it an ice sheet. The area of the Greenland ice sheet is 1.7 million km² which is more than the areas of Denmark, Norway, Sweden, Finland and Iceland put together.
Almost all of Greenland is covered with a thick layer of ice. In some places the ice is up to 3 km thick. The Greenland ice sheet has been there for a long time. Scientists believe that ice started to grow and stay on Greenland about 3–4 million years ago. However, as you can see on the map, there are also places on Greenland without ice.
Click next and see what the ice sheet looks like.