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podcast transcript
From the oldest rock formations on Earth to underground villages, lost rivers, red deserts, cattle stations, opal fields and star-filled skies, the Australian outback is one of the most iconic yet misunderstood places on Earth.
It is not empty, nor is it just a desert.
It is a land created over a long period of time, extreme conditions, ancient culture, and modern industry.
Learn more about the Australian outback in this episode of Everything Everywhere Daily.
The first thing to understand about the Australian outback is that it is not a single, legally defined region. It is a term used to roughly describe Australia’s vast inland, remote core, generally understood to include arid and semi-arid interiors and deserts.
The general definition of the outback is 5.6 million square kilometers, or more than 70% of the continent’s total area. Essentially, it’s everything beyond the coastal fringes where most Australians live.
The only states that do not constitute the outback are generally considered Victoria and Tasmania.
The biggest defining factor and reason for the outback’s existence is its geology. The outback is a very old place, even by geological standards. Australia has rocks that are more than 3 billion years old.
What makes the Outback geologically old is that the continent is relatively geologically inactive. There are no colliding tectonic plates. There is no subduction, no volcanoes, no mountain buildings. It borders the Pacific Ocean but is not part of the Ring of Fire.
The end result is that nothing happens geologically in Australia. In some ways this is a good thing. Australia does not experience volcanic eruptions or earthquakes like its northern neighbor Indonesia.
This geological stability has led to continuous, slow erosion over millions of years. This is why the outback is so flat, deeply weathered and rich in mineral deposits.
Erosion has had time to reduce mountains, expose older rocks, and create large plains, rock formations, and basins. The red color, closely associated with the outback, comes primarily from weathered rocks and iron oxides in the soil. Simply put, much of the inland has been rusting for millions of years.
This geological stability and erosion has exposed some of the oldest rocks on Earth. The oldest material discovered in Australia is a zircon crystal from Western Australia’s Jack Hills, estimated to be about 4.4 billion years old, making it one of the oldest minerals known to have originated shortly after the planet formed.
Another element that defines the outback is water, or its scarcity. Precipitation is sparse, unreliable, and highly variable. Some years there is drought and dust. Others bring floods that fill dry riverbeds and turn desert basins into temporary wetlands.
Inland climates can be extremely hot. Summer temperatures in many areas can exceed 40°C (104°F). Nights can be cold, especially in desert areas where dry air allows heat to escape quickly after sunset. The outback is not uniformly hot all year round.
I have experienced both of these temperature extremes. Our first trip to Uluru was in the winter of July, and we had to endure camping outdoors as temperatures dropped below freezing at night. The next trip was in the summer, in December. At that time, temperatures were approaching 50°C or slightly below 120°F.
The northern outback region has wet and dry seasons, with northern monsoon rains supplying rivers that can carry water to drier inland areas.
The outback may seem empty to those who don’t understand it, but it is ecologically complex. Those plants and animals adapted to water unpredictability rather than water scarcity.
There is a cycle of boom and bust in the outback. After rain, seeds germinate, grasses spread, insects reproduce, frogs appear, birds breed, and mammals take advantage of the sudden abundance. When dry conditions return, many species retreat, become dormant, migrate, reduce activity, or survive on scarce resources.
The plants present depend on soil, rainfall and fire. Spinifex grasslands occupy most of the desert interior. Mulga, a type of acacia, forms extensive woodlands in semi-arid regions. Eucalyptus lines dry stream beds with more underground moisture. Saltbush and bluebush occur in drier rangelands.
Animal life is equally specialized. Red kangaroos, dingoes, emus, wedge-tailed eagles, marsupial moles, jumping mice, parrots and many types of reptiles are associated with inland Australia. Reptiles are particularly successful because they tolerate heat and dry environments better than many mammals. Many small mammals are nocturnal, digging burrows during the day to escape the heat and emerging at night.
Aboriginal people have lived in the outback for at least 50,000 years and inhabit all outback regions, including the driest deserts. There was no single “outback people” or single indigenous culture.
If you look at the map of Australia’s indigenous languages, you’ll see hundreds of regions where different languages are spoken. Generally speaking, these zones were smaller on the coast, where food and water were more abundant. People could afford to live a more sedentary lifestyle.
Inland, the language area is much larger. Water shortages in the outback meant it could not support high population densities, and people living there had to move much more frequently.
Because rainfall is unreliable, permanent water resources have always been central to life. Rock holes, springs, waterholes, and rivers were very important to the native people.
Many Indigenous Australians maintain strong physical and cultural links to their traditional lands and are legally recognized as the traditional owners of most of the outback under Commonwealth Native Title laws.
Much of Aboriginal culture, including art and mythology, is deeply rooted in the arid landscapes of the outback. According to some indigenous myths, the Outback was created by spirits that moved across the land, summoning animals, plants and rocks along the way.
For Europeans, the outback was initially perceived as a mystery and often as a problem. Early colonists concentrated near the coast, where rainfall was more reliable and transportation was easier.
The inland area looked rough. 19th-century explorers sought to cross, map, locate inland seas, find grazing lands, and open the way for settlement. Some expeditions ended in disaster. Others produced maps and reports encouraging ministry expansion.
The first Europeans to explore the outback were Gregory Blaxland, William Lawson and William Charles Wentworth. They passed through the Great Dividing Range of New South Wales in 1813, making this part of inland Australia available to other settlers.
Following the expeditions of 1858, 1860 and 1862 led by Scottish explorer John McDouall Stuart, settlement in remote areas increased significantly. These expeditions led to the founding of the Overland Telegraph in 1872 and the construction of several roads linking villages in the outback.
Camels were introduced to the outback in the 19th century. That’s because horses were ideal for crossing the dry interior, where heat, distance and lack of water often plagued them. They were mainly imported from India, Afghanistan and the Middle East and handled by camele drivers. Many of them were widely known as “Afghans” even though they did not necessarily come from Afghanistan.
Its importance declined in the early 20th century with the advent of railroads, trucks, and automobiles. Many camels were subsequently released into the wild or escaped and adapted well to the dry environment of the outback. With few natural predators and vast open ranges, their numbers have increased, creating what is now the world’s largest wild camel population.
The main driver of inland settlement was ranching. Sheep and cattle farms spread inland in the 19th century, often along rivers, groundwater, and newly discovered grasslands.
Due to low rainfall and low carrying capacity, the size of the observatory can be enormous. A single property can cover thousands of square miles.
Another big economic driver in the outback was mining.
Coober Pedy was founded in 1915 after the discovery of opal in the South Australian desert by a teenager named Willie Hutchison, who was part of a gold prospecting expedition.
The city grew as miners arrived to mine opal in one of Australia’s harshest environments, where summer temperatures can be extreme and surface life is difficult.
Because of the heat, many people built their homes, churches, shops, and hotels underground, where temperatures were much more stable. I stayed in an underground hotel in Coober Pedy and, needless to say, it was a unique experience.
Mining and strategic minerals are the biggest businesses in the outback today. It’s all because of the geological phenomenon I covered at the beginning of the episode.
The outback produces iron ore, gold, copper, uranium, nickel, lithium, manganese, lead, zinc, silver, opals, diamonds and rare earth elements. Geoscience Australia says Australia produces significant quantities of 19 valuable minerals from more than 350 operating mines.
The single most important commodity is iron ore, particularly in the Pilbara region of Western Australia. It is key to global steel manufacturing, especially for China and other Asian industrial economies. Australian iron ore exports in 2025 were estimated at approximately A$116 billion.
Gold is another major outback mineral. Western Australia’s gold mines, particularly around Kalgoorlie, remain one of the world’s largest gold producing regions.
Lithium and rare earths have made the Outback more strategically important. Australia has become a major supplier of minerals needed for batteries, electric vehicles and electronics.
Working in a mine in the outback often means working in a remote location on a roster system. Many workers are fly-in fly-out. That means flying from the city to the mine site, working for a block, and then flying home for the holidays.
A typical roster might be one week on and one week off, two weeks on and one week off, or more, depending on the job. Workers typically live in mine camps where they are provided with meals, lodging, a gym, and basic recreation.
We’ll end with a look at some of the most interesting places to visit in the outback.
Kakadu National Park in the Northern Territory is undoubtedly one of Australia’s best national parks. I covered this in a previous episode about the largest national parks.
Western Australia’s Purnululu National Park is best known for the Bungle Bungle Range, a series of honeycomb-shaped sandstone domes streaked with orange and dark gray. Remote gorges, crevices and unusual terrain make it one of the outback’s most unique natural attractions.
Being located in the northeastern corner of Western Australia, it is not easy to get to, being several hours’ drive from the main road. But it is worth the trip and was the highlight of the drive from Darwin to Perth.
Uluru, also known as Ayers Rock, is a massive sandstone monolith in central Australia, notable for its red color and dramatic rise from the surrounding desert plains. It is also next to Kata Tjuta, another overlooked rock formation that is part of the same national park.
The aforementioned Coober Pedy is well worth a visit if you’re in South Australia. It is one of the world’s centers of opal mining. I was actually able to go with the miner to his dig site and help him out for an afternoon. There are many stores where you can buy polished opal wholesale.
The outback geographically makes up the majority of Australia. However, due to the isolation, lack of water and heat, less than 5% of the population lives there. Most visitors stick to the major cities, especially the East Coast, but this is easily the most exciting and arguably the most economically important part of the country.
