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Great Dividing Range

geography Maturity 7-9 Next article →

The Great Dividing Range is a massive cordillera system in eastern Australia. A cordillera is a complex group of mountain ranges, plateaus, and hills. This system is the most significant topographic feature on the Australian mainland. It is the fifth-longest land-based mountain chain in the world. It also holds the record for the longest chain located entirely within a single country.

Mt hotham alpine range scenery
Mt hotham alpine range scenery

The range runs roughly parallel to the eastern coastline of Australia. It begins near Dauan Island in the Torres Strait. From there, it stretches through Queensland and New South Wales. It eventually turns west across Victoria. Finally, it fades into the Wimmera plains as rolling hills.

GreatDividingRangeSign
GreatDividingRangeSign

The range functions as a definitive watershed for eastern Australia. A watershed is a boundary that determines the direction of water drainage. The crest of the range separates two different drainage basins. Rivers on the eastern or rainward side drain toward the South Pacific Ocean. They may also flow into the Tasman Sea or the Bass Strait. In contrast, rivers on the western or leeward side flow toward the inland. Some flow into the Murray–Darling basin. Others drain into the Lake Eyre basin or the Gulf of Carpentaria. This division shapes the entire water system of the continent.

Geologically, the Great Dividing Range is not one single continuous chain. It is a complex collection of different landforms. These include mountain ranges, plateaus, hilly uplands, and steep escarpments. The mountains and plateaus are composed of various rocks. These include limestone, sandstone, quartzite, schists, and dolomite. These features were created through processes called faulting and folding.

BrightVictoria2
BrightVictoria2

The terrain varies greatly in shape and height. In some areas, the land is relatively flat with very low hills. In other areas, the highlands form a significant and rugged barrier. The age of the range means many peaks are not extremely steep. Most can be reached without special mountaineering equipment.

The climate of the region is heavily influenced by the mountains. This occurs primarily through a process called orographic precipitation. This happens when air is forced upward by the terrain. This process can create a rain shadow on the leeward side. In southern New South Wales, a phenomenon called the Föhn effect occurs. This is a dry wind that originates from the range. As the air moves down the lee slopes, it undergoes adiabatic compression. This means the air heats up and loses moisture. Consequently, the areas in the rain shadow are much drier.

Worldwind-SnowyMountains
Worldwind-SnowyMountains

During the cool season, the range also acts as a shield. It protects the southeast from cold fronts from the Southern Ocean. This results in wetter winters on the windward side of the mountains.

The history of the range began over 300 million years ago. This was during the Carboniferous period. At that time, Australia collided with parts of South America and New Zealand. For tens of thousands of years, Aboriginal Australian peoples lived in these ranges. They used traditional trails to travel between the coast and the interior. Evidence of their lives remains in decorated caves and campsites. After British colonisation in 1788, the mountains became an obstacle for settlers. The rugged sandstone mountains were very difficult to navigate.

Katoomba scenic railway track 1
Katoomba scenic railway track 1

European explorers eventually found usable routes by following established Aboriginal walking trails. This discovery allowed for the development of inland agricultural districts.

The range contains many notable landmarks and distinct regions. The highest point in Australia is Mount Kosciuszko. It is located within the Snowy Mountains section of the southern range. Other significant areas include the Australian Alps and the Blue Mountains. The range also includes many smaller spurs and ranges. These include the Dandenong Ranges, the Bunya Mountains, and the McPherson Ranges.

Dangar Falls Dorrigo (1)
Dangar Falls Dorrigo (1)

Some areas feature spectacular waterfalls. These are formed by rivers plunging off the high tablelands. The range also provides important spaces for recreation. Many major ski resorts, such as Thredbo and Perisher, are located here.

Mt. Feathertop444 edit
Mt. Feathertop444 edit

Today, the Great Dividing Range is vital to Australian life and industry. Many large cities are located on or near the upland areas. These include Canberra, Brisbane, and the outer suburbs of Sydney and Melbourne. Certain parts of the highlands are used for agriculture and pastoral farming. For example, the Darling Downs and the Northern Tablelands are productive areas. Other rugged sections are used for forestry. Many of the most beautiful and untouched areas are now protected as National Parks. This helps preserve the complex ecosystem of the cordillera for the future.

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🖼️ Images & Media (7)
File:Worldwind-SnowyMountains.jpg
Worldwind-SnowyMountains.jpg
File:GreatDividingRangeSign.jpg
GreatDividingRangeSign.jpg
File:BrightVictoria2.jpg
BrightVictoria2.jpg
File:Dangar Falls Dorrigo (1).JPG
Dangar Falls Dorrigo (1).JPG
File:Katoomba scenic railway track 1.jpg
Katoomba scenic railway track 1.jpg
File:Mt hotham alpine range scenery.jpg
Mt hotham alpine range scenery.jpg
File:Mt. Feathertop444 edit.jpg
Mt. Feathertop444 edit.jpg
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