Physical Geography of Greenland: Ice, Mountains & Arctic Extremes

Greenland (Kalaallit Nunaat) is a land of superlatives: the world's largest non-continental island, home to the second-largest ice sheet, and a frontier of climate change.

Scale & Dimensions

• Area: 2,166,086 km² (836,330 sq mi) – 80% ice-covered
• Dimensions: 2,670 km N–S × 1,050 km E–W (max)
• Coastline: 44,087 km – deeply fjord-indented

Ice Sheet (Inlandis)

• Coverage: 1.71M km² (660,000 sq mi)
• Volume: 2.85M km³ – 7.4 m global sea-level equivalent
• Thickness: Avg 2,135 m; max 3,200 m
• Age: Base ice ~100,000–1M years; continuous core records
• Flow: Radial outflow → outlet glaciers → fjords → icebergs

Mountains & Topography

• Highest: Gunnbjørn Fjeld (3,694 m / 12,119 ft) – Watkins Range, East Greenland
• Coastal Ranges: Dramatic alpine peaks (2,000–3,500 m) rimming the ice sheet, especially east/west coasts
• Nunataks: Mountain peaks piercing the ice sheet – critical refugia for life

Fjord Systems

• Glacially carved, U-shaped valleys flooded by sea
• Depths >1,000 m (3,000+ ft) – among world's deepest
• Major: Scoresby Sund (world's largest fjord system, 38,000 km²), Nuup Kangerlua (Godthåb Fjord), Kangerlussuaq

Glaciers & Icebergs

• Productivity: ~250–300 km³/year calved
• Sermeq Kujalleq (Jakobshavn Isbræ): World's fastest glacier (~40 m/day); UNESCO site; Titanic's iceberg likely source
• Icebergs: Tabular (ice sheet origin) vs. pinnacle (glacier origin); track into North Atlantic shipping lanes

Hydrology

• Rivers: Short, glacial-fed; Watson River (Kangerlussuaq), Kangerlussuaq River – high sediment, seasonal
• Lakes: Supraglacial (on ice), proglacial (margin), epishelf (fjord-dammed); Tasersuaq, Ammassalik largest

Climate & Ecology

• Zones: High Arctic (north), Low Arctic (south), Ice Cap (interior)
• Temps: -30°C to -10°C (winter); 0°C to 10°C (summer coast)
• Precipitation: 100–900 mm (coast to ice sheet) – mostly snow
• Vegetation: Tundra (moss, lichen, dwarf shrub); no trees above ~200 m; 500+ vascular plant species
• Wildlife: Polar bear, musk ox, caribou, Arctic fox/hare, 60+ breeding birds, whales, seals, walrus

Human Footprint

56,000 residents (89% Inuit) in 17 towns/settlements—all coastal, ice-free. No roads between towns; air/sea only. Thule Air Base (US) northwest.