Southern Hemisphere

Southern Hemisphere
Sean Baker ( Marvin01 \| talk ) · CC BY 2.0 · source
Name	Southern Hemisphere
Location	Southern part of Earth
Area km2	103_000_000
Population	2.7 billion (approx.)
Notable cities	Buenos Aires, São Paulo, Johannesburg, Sydney, Melbourne, Perth, Cape Town, Auckland

Contents

Southern Hemisphere The Southern Hemisphere is the half of Earth south of the equator, encompassing most of the Pacific Ocean (South) and large portions of the Atlantic Ocean and Indian Ocean. It contains continents and countries including Antarctica, Australia, South America, much of Africa, and parts of Asia such as Indonesia and East Timor. Major capitals and metropolises such as Brasília, Buenos Aires, Santiago (Chile), Pretoria, Canberra, and Jakarta lie within its bounds, and its demography and environment influence global systems like the El Niño–Southern Oscillation and the Antarctic Treaty System.

Geography and Boundaries

The latitudinal divide is defined by the Equator, a great circle intersecting oceans near the Gulf of Guinea and landmasses near São Tomé and Príncipe and Indonesia. Its southernmost extent is at the South Pole on Antarctica, with geographical margins shaped by features such as the Andes, the Great Dividing Range, the Drakensberg, and island groups including the Galápagos Islands, the Falkland Islands, New Zealand, and the Subantarctic islands. Oceanic boundaries include the Southern Ocean as delimited by various nations and by the International Hydrographic Organization definitions; maritime routes traverse chokepoints like the Cape of Good Hope and the Strait of Magellan. Plate tectonics involving the Nazca Plate, South American Plate, African Plate, Australian Plate, and Antarctic Plate shape seismic and volcanic activity in regions such as the Ring of Fire and the East African Rift.

Climatic regimes range from polar conditions in Antarctica to tropical climates in parts of Brazil, Indonesia, and Madagascar, with temperate belts across Argentina, Chile, South Africa, and New Zealand. Seasonal patterns are inverted relative to the Northern Hemisphere: austral summer occurs during December–February and austral winter during June–August, affecting phenomena like monsoon cycles in Mozambique and Indian Ocean influences on Australia and Madagascar. Large-scale drivers include the El Niño–Southern Oscillation, the Southern Annular Mode, and the Indian Ocean Dipole, which modulate precipitation, cyclogenesis for systems such as Cyclone Pam and Cyclone Tracy, and heat transport via the Antarctic Circumpolar Current and the South Equatorial Current.

The hemisphere hosts endemic hotspots such as the Cape Floristic Region, the Atlantic Forest, the Amazon Rainforest (southern sectors), the Cerrado, the Valdivian temperate rainforests, and the Madagascar and Indian Ocean Islands biodiversity hotspot. Marine zones include the Great Barrier Reef, Patagonian Shelf, and productive upwelling areas off Peru and Namibia. Iconic taxa include kiwi, emu, cassowary, Galápagos tortoise, lemur species, penguin clades like the emperor penguin and king penguin, and cetaceans studied around South Georgia and the South Sandwich Islands and the Ross Sea. Conservation frameworks involve agreements and organizations such as the Convention on Biological Diversity, the Ramsar Convention, and national parks like Kruger National Park, Torres del Paine National Park, Kakadu National Park, and Fiordland National Park.

Population distribution concentrates in urban corridors such as the Southeast Brazilian megalopolis, the Gauteng City Region, the Sydney Basin, and the Greater Jakarta. Demographic histories reflect indigenous societies including Mapuche, Quechua, Aymara, Maori, Aboriginal Australians, San people, Khoikhoi, Bantu peoples, and Papuan peoples intersecting with colonization by Spanish Empire, Portuguese Empire, Dutch East India Company, British Empire, and subsequent migration flows from Italy, Lebanon, China, India, and Japan. Urban infrastructure links seaports like Port of Santos, Port of Durban, and Port of Sydney with transcontinental corridors such as the Pan-American Highway (Southern Cone), regional air hubs including Guarulhos International Airport, O. R. Tambo International Airport, and Sydney Airport, and cultural institutions like the Museo Nacional de Bellas Artes (Argentina), Auckland War Memorial Museum, and National Museum of Australia.

Economic activities encompass resource extraction (minerals from Pilbara, Atacama Desert, Congo Basin), agriculture in the Pampas, Prairies of Brazil, and New South Wales; fisheries off Peru and Namibia; and services concentrated in São Paulo, Sydney, and Johannesburg. Trade networks connect commodity exporters such as Chile (copper), Australia (iron ore, coal), Brazil (soybeans, beef), and Indonesia (palm oil) with importers in China, Japan, and European Union. Financial centers include São Paulo Stock Exchange, Johannesburg Stock Exchange, and Australian Securities Exchange, while multilateral institutions like the United Nations and regional blocs including Mercosur, the African Union, and the Association of Southeast Asian Nations influence policy and investment flows.

Indigenous occupation dates back tens of thousands of years with archaeological records from sites such as Monte Verde, Lascaux is Northern Hemisphere so not linked, but southern examples like Teouma and Lake Mungo documenting early human presence. European exploration accelerated with voyages by Ferdinand Magellan, James Cook, Pedro Álvares Cabral, and expeditions such as the Voyage of the Beagle and James Cook's third voyage that mapped coastlines and led to colonization, whaling, and sealing around South Georgia and Falkland Islands. Scientific initiatives include the International Geophysical Year, polar campaigns under the British Antarctic Survey and Australian Antarctic Division, and landmark treaties like the Antarctic Treaty that established governance for scientific research and environmental protection. Decolonization movements produced independent states including Argentina, Brazil, South Africa, Indonesia, and Papua New Guinea, shaping 20th-century geopolitics and contemporary regional cooperation.

Category:Hemisphere