Australia (continent)

The continent of Australia is a unique landmass in the Southern and Eastern hemispheres.

It is located near Maritime Southeast Asia within the region of Oceania. While many people use the name "Australia" for both the country and the continent, scientists often use other names. They use Sahul, Australinea, or Meganesia to describe the entire continental area. This helps distinguish the massive landmass from the specific country of Australia. The continent is the smallest of the seven traditional continents on Earth.

The continent consists of several distinct landmasses sitting on a single continental plate.

These include mainland Australia, the island of Tasmania, and the large island of New Guinea. New Guinea contains the country of Papua New Guinea and the Indonesian region of West Papua. Other parts include the Aru Islands, the Ashmore and Cartier Islands, and the Coral Sea Islands. A continental shelf lies beneath shallow seas that divide these lands. The Arafura Sea and Torres Strait separate mainland Australia from New Guinea. The Bass Strait sits between the mainland and Tasmania.

Geological history shows that these landmasses were once connected. During the Pleistocene ice age, sea levels were much lower. Around 18,000 BC, during the Last Glacial Maximum, the lands formed a single mass called Sahul. The name comes from the Sahul Shelf, which is part of the continental shelf.

Between 18,000 and 10,000 years ago, rising sea levels changed the landscape. The water flooded the lowlands and separated the land. This created the low-lying, arid mainland we see today. It also formed the mountainous islands of New Guinea and Tasmania.

Human history on the continent began with very early migrations. Indigenous Australians, including Aboriginal Australians and Torres Strait Islanders, are the original inhabitants. They migrated from Africa to Asia roughly 70,000 years ago. Evidence suggests they arrived on the continent at least 50,000 years ago. Some recent research suggests they may have arrived as early as 65,000 years ago. This represents one of the earliest human migrations out of Africa.

These people have deep cultural ties to the land and its history.

Modern life on the continent varies greatly between different areas. The country of Australia is highly urbanised, meaning most people live in cities. It has the world's 14th-largest economy and a very high human development index. It also holds the ninth largest immigrant population globally.

In contrast, Papua New Guinea is one of the most rural places. Only 18 percent of its people live in urban centres. In West Papua, an estimated 44 uncontacted tribal groups still live.

Understanding the continent involves looking at how geographers define it. In the 19th century, definitions of Oceania were often divided by race. Some used terms like Melanesia, Micronesia, and Polynesia. In the 1950s, the concept of Australia as a continent became more popular in English-speaking countries. This happened as the theory of plate tectonics gained scientific support. Today, the United Nations recognizes Oceania as one of the five major continental divisions. This definition includes Australia and many surrounding Pacific islands.

The continent's physical characteristics are extreme in several ways. It is the smallest, lowest, and flattest continent on Earth. It is also the second-driest continent, following Antarctica. These features shape the environment and the life found there. For example, the mainland is often arid or semi-arid. Meanwhile, New Guinea and Tasmania are mountainous. These physical differences create many different habitats across the single continental plate.