Greenland is a vast island with a unique topography of mountains, glaciers, and ice sheets.
The Greenland ice sheet is the second-largest ice sheet in the world after Antarctica with an average elevation of 2,135 meters.
The ice sheet covers about 80% of the island and has an estimated volume of 2.8 millions km³.
The other 20% of the island is a mix of mountain ranges, valleys, and sizable fjords.
The highest point in Greenland is Gunnbjørn Fjeld, which stands tall at 3,694 meters above sea level and is located in the Watkins Range of southeastern Greenland.
The lowest point in Greenland is the Arctic Ocean which is at sea level.
See here a list of 10 cities in Greenland and their elevation above sea level.