Oceania

• 1. Introduction

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  Oceania covers roughly nine million square kilometres of land, yet it is the ocean, not the land, that holds it together. This is the only one of the major continental groupings named for water rather than soil. Around 46.3 million people live across it as of 2024, when Australia is counted in and the Malay Archipelago is left out. That makes it the smallest of the continental land areas, and the second-least populated after Antarctica. Spread across the Eastern and Western hemispheres, it sits at the centre of the water hemisphere, a scatter of islands between mainland Asia and the Americas. The Pacific Ocean alone holds roughly 25,000 islands, more than all the other major oceans combined. So why is a region defined by emptiness treated as a continent at all? Who first drew its borders, and why have geographers argued about where those borders fall for more than two centuries? And how did people reach these remote specks of land long before any European map named them?

• 2. A Continent Of Water

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  Conrad Malte-Brun coined the French expression Terres oceaniques, meaning Oceanic lands, around 1804. A decade later, in 1814, the cartographer Adrien-Hubert Brue shortened it to Oceanie, a word descending from the Latin and ultimately from the Greek okeanos, meaning ocean. The name fit a region unlike the others. Here it is the sea that links the parts together, not a shared landmass. John Eperjesi's 2005 book The Imperialist Imaginary notes that Western cartographers have used the term since the mid-19th century to organise and classify the Pacific. National Geographic defines Oceania as a continent based on its connection to the Pacific Ocean rather than its landmass. Others have called it the liquid continent, and the Pacific itself has been described as a continent of islands. The lone exception to the region's wateriness is Australia, the only piece of land here large enough to typically count as a continent. Before Europeans arrived, the sea shielded Australia and the south central Pacific islands from cultural currents that swept across continental landmasses. In a 1991 article, the archaeologist Toni L. Carrell wrote that the vast size and distances within the Pacific Basin make it hard to view as a single geographical unit.

• 3. The Borders Nobody Agrees On

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  James Cowles Prichard, a British physician and ethnologist, argued that the Aleutian and Kuril Islands marked the northern edge of Oceania, then promptly excluded them because their inhabitants had no ties to the remote Pacific peoples. Disagreement like this runs through the whole history of the term. Definitions of Oceania vary, and the broadest stretches across every island between mainland Asia and the Americas. Alfred Russel Wallace believed in 1879 that Oceania reached as far as the Aleutian Islands. The American geographer Sophia S. Cornell flatly rejected that in 1857, ruling the Aleutians out and splitting Oceania into Australasia, Malesia, and Polynesia. The disputes reached down to single rocks. The geographic extremes have been taken as the Bonin Islands, integral to Japan; Hawaii, a state of the United States; Clipperton Island, a possession of France; Rapa Nui, also called Easter Island, belonging to Chile; and Macquarie Island, belonging to Australia. The 1998 Encyclopedia of Earth and Physical Sciences admitted the term had come under scrutiny, with experts split over whether Indonesia, the Philippines, and Taiwan belong. New names tried to cut through the confusion. In 1973 the anthropologists Roger Green and Andrew Pawley proposed Near Oceania and Remote Oceania to dispel the older racially based categories of Melanesia, Micronesia, and Polynesia. Since the early 1990s many scholars have adopted Green's terms, though the old categories still survive in science and popular usage.

• 4. Drawing The Official Map

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  The United Nations has used its own geopolitical definition since its foundation in 1947, built on four of the five 19th-century subregions: Australasia, Melanesia, Micronesia, and Polynesia. That definition runs on discrete political entities, so it leaves out the Bonin Islands, Hawaii, Clipperton Island, and Easter Island, which Chile annexed in 1888. In 1947 the boundaries reflected a colonial world. Hawaii had not yet become a US state, so it sat inside the original UN definition, and Dutch New Guinea was already counted as part of Asia. The roster the UN draws includes American Samoa, Australia and its external territories, the Cook Islands, the Federated States of Micronesia, French Polynesia, Fiji, Guam, Kiribati, the Marshall Islands, Nauru, New Caledonia, New Zealand, Niue, the Northern Mariana Islands, Palau, Papua New Guinea, the Pitcairn Islands, Samoa, the Solomon Islands, Tokelau, Tonga, Tuvalu, Vanuatu, and Wallis and Futuna. The island states of Indonesia, Japan, the Philippines, Singapore, and Taiwan are excluded, though each lies within the Pacific or its marginal seas. The CIA World Factbook draws nearly the same lines under the name Australia and Oceania, used for statistical purposes. It diverges on the small things. Unlike the UN, the Factbook treats the uninhabited Clipperton Island as a discrete political entity and files it under North America, presumably because it sits 1,200 kilometres off Mexico. From the early 20th century until 2007, Clipperton was administratively part of French Polynesia, which itself was known as French Oceania until 1957.

• 5. Sixty Thousand Years Of Arrivals

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  The first settlers of Australia, New Guinea, and the large islands just to the east arrived more than 60,000 years ago. Indigenous Australians migrated from Africa to Asia around 70,000 years ago and reached Australia around 50,000 years ago, among the earliest human migrations out of Africa. They crossed into Tasmania around 40,000 years ago over a land bridge that existed during the last ice age. The earliest definite human remains in Australia are those of Mungo Man, dated to around 40,000 years old. The deep past left genetic traces. Between 4% and 6% of the genome in Melanesians, such as Papua New Guineans and Bougainville Islanders, derives from the Denisova hominin, an ancient human species discovered in 2010, while no Eurasians or Africans carry Denisovan genes. The Austronesian wave came far later. Between roughly 3000 and 1000 BCE, speakers of Austronesian languages spread from Taiwan into Island Southeast Asia, reaching the edges of western Micronesia and on into Melanesia. By roughly 1400 BCE the Lapita Peoples, named for their pottery tradition, appeared in the Bismarck Archipelago of north-west Melanesia. Polynesian origins trace through the Malay Archipelago and ultimately back to Taiwan. The last great islands filled in remarkably recently. Easter Islanders said a chief named Hotu Matua found their island in one or two large canoes with his wife and extended family. A recent study using radiocarbon dates from very early material suggests the island was discovered and settled as recently as the year 1200.

• 6. Europe Crosses The Pacific

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  On the 28th of November 1520, Ferdinand Magellan's Spanish expedition entered an ocean he named the Pacific, having sailed through the strait that now bears his name. The trade winds carried his three remaining ships across to the Philippines, where Magellan was killed. One surviving ship under Juan Sebastian Elcano returned west across the Indian Ocean, and the Magellan-Elcano expedition achieved the first circumnavigation of the world. The Portuguese had arrived first. Between 1512 and 1526 their navigators reached the Maluku Islands, Timor, the Aru Islands, the Tanimbar Islands, some of the Caroline Islands, and west Papua New Guinea. Willem Janszoon made the first fully documented European landing in Australia in 1606, at the Cape York Peninsula. Abel Tasman reached Van Diemen's Land, now Tasmania, along with New Zealand in 1642 and Fiji, the first known European explorer to find these islands. On the 23rd of April 1770, the British explorer James Cook made his first recorded direct observation of Aboriginal Australians at Brush Island near Bawley Point. On the 29th of April his crew made their first landfall on the mainland, at the place now called the Kurnell Peninsula. There Cook made first contact with an Aboriginal tribe known as the Gweagal, and his expedition became the first recorded Europeans to encounter the eastern coast of Australia.

• 7. Empire And War

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  In 1789 the mutiny on the Bounty against William Bligh sent several mutineers to settle on the Pitcairn Islands, which later became a British colony. The arrival of European settlers reshaped the social and political landscape of the region. Britain established colonies in Australia in 1788, New Zealand in 1840, and Fiji in 1872, and much of Oceania became part of the British Empire. France moved through its missionaries. After French Catholic missionaries were expelled from Tahiti in 1836, France sent a gunboat in 1838, and in 1842 declared Tahiti and Tahuata a protectorate. On the 24th of September 1853, under orders from Napoleon III, Admiral Febvrier Despointes took formal possession of New Caledonia. Other powers carved out their own shares. Germany established colonies in New Guinea in 1884 and Samoa in 1900, while the United States expanded with Baker Island and Howland Island in 1857 and Hawaii becoming a US territory in 1898. The Pacific theatre saw major action in both World Wars. One of the first land offensives was New Zealand's occupation of German Samoa in August 1914, which ended without bloodshed after more than 1,000 New Zealanders landed. The attack on Pearl Harbor on the morning of the 7th of December 1941 led to the United States entering World War II. The Japanese were turned back at the Battle of the Coral Sea and the Kokoda Track campaign before their final defeat in 1945.

• 8. Fire, Reef And Cliff

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  Biologists in Hawaii rappel down 3,000-foot cliffs to brush pollen onto the stigmas of an endemic plant called Brighamia, because its natural pollinator is presumed extinct. Its two species, B. rockii and B. insignis, survive in the wild as around 120 individual plants. Oceania's islands come in four basic types: continental islands, high islands, coral reefs, and uplifted coral platforms. High islands are volcanic, and many hold active volcanoes, among them Bougainville, Hawaii, and the Solomon Islands. The Great Barrier Reef off northeastern Australia is one of the most dramatic coral structures, a chain of reef patches built up on basaltic lava flows beneath the surface. Australia is the most environmentally diverse country here, with tropical rainforests in the north-east, mountain ranges in the south-east, south-west, and east, and a desert at the centre. Its flora is shaped by adaptations to aridity and fire, including scleromorphy and serotiny, common in the families Proteaceae, Myrtaceae, and Fabaceae. It is the lowest, flattest, and oldest landmass on Earth. New Zealand's geology tells a different story, marked by volcanic activity, earthquakes, and geothermal areas owing to its position on the boundary of the Australian and Pacific Plates. Earthquakes there average 3,000 a year, usually not severe. The South Island is dominated by the Southern Alps, which hold 18 peaks above 3,000 metres, the highest being Aoraki, also called Mount Cook, at 3,754 metres. The region is also home to Earth's third-largest remaining area of tropical rainforest, which blankets much of the island of New Guinea, the world's second largest island after Greenland.