The Arctic is the high-latitude region surrounding the Earth's North Pole and extending across the northernmost parts of several countries. It includes portions of Russia, the U.S. state of Alaska, northern Canada, Greenland, and the Scandinavian areas often called Lapland and Svalbard. The central basins are covered by the Arctic Ocean, an oceanic region characterized by seasonal and multi-year sea ice.
Geography and climate
Geographically the Arctic is defined in several ways: by latitude, by the tree line, or by sea-ice extent. Much of the area north of the Arctic Circle is cold enough that trees cannot grow, so scientists often use the treeline to mark the transition from boreal forest to tundra. The marine environment is an ocean basin that is mostly covered with ice at least part of the year. The only large, year-round land ice sheet is that of central Greenland; elsewhere ice cover is seasonal or limited to glaciers and ice caps.
Climate in the Arctic features long, cold winters and short, cool summers. During summer at high latitudes the tilt of the Earth means the Sun can remain above the horizon for extended periods, producing the phenomenon often called the Midnight Sun. Permafrost — a layer of permanently frozen ground — underlies much of the terrestrial Arctic and strongly influences hydrology and vegetation; this frozen substrate is commonly called permafrost.
Ecosystems, plants and animals
The Arctic land is dominated by tundra ecosystems: low-growing vegetation such as mosses, lichens, sedges and dwarf shrubs adapted to a short growing season. Despite seeming sparse, tundra and adjacent marine ecosystems support a diverse set of animals, including migratory birds, seals, walrus, Arctic foxes and the iconic polar bear. Species composition and productivity vary with sea-ice cover, coastal conditions and local climate.
Human presence, history and name
Indigenous peoples have lived across the Arctic for millennia and rely on marine and terrestrial resources for cultural and economic life. European exploration, scientific expeditions and later resource and shipping interests expanded contact with the region. The word "Arctic" traces to the ancient Greek arktos, meaning "bear", a reference to the constellations the Great Bear and Little Bear; the polar region points toward those stars (Great Bear and Little Bear). The North Pole itself remains a geographic and symbolic reference point (North Pole).
Importance and contemporary issues
The Arctic matters globally for climate regulation, sea-level pathways and biodiversity. It contains natural resources and potential shipping routes and is increasingly prominent in policy discussions about conservation, indigenous rights and national sovereignty. Changes in sea-ice and permafrost driven by warming temperatures affect wildlife, coastal communities and infrastructure, prompting scientific monitoring and international cooperation focused on resilience and sustainable management.
- Key features: sea ice, permafrost, tundra, Arctic Ocean basin.
- Human aspects: indigenous cultures, exploration history, modern governance challenges.
- Natural hazards: extreme cold, seasonal darkness, fragile ecosystems that respond rapidly to warming.
For introductions and more detailed maps, consult general references and regional organizations that study the Arctic environment and communities (global context, Arctic Circle). Additional resources provide focused information about particular countries, protected areas and scientific monitoring networks.
Further reading: regional atlases and scientific assessments remain the best sources for current data on ice extent, permafrost depth and species status; online portals and government agencies offer updates and guidance for researchers and the public.