Leslie Massey
Australia's western coastline is bordered by the Indian Ocean to the north and west, and the Southern Ocean to the south. The Southern Ocean is also known as the Antarctic Ocean and is considered part of the Indian Ocean by the International Hydrographic Organization (IHO). Western Australia, the westernmost state of Australia, has a rugged and dangerous coastline with strong currents and a tidal range of up to 39 feet (12 metres). The state boasts a diverse range of climates, from tropical conditions in the Kimberley region to deserts in the interior and a Mediterranean climate along the southern coastal areas.
| Characteristics | Values |
|---|---|
| Name of the ocean | Indian Ocean (also known as the Southern Ocean or Antarctic Ocean in Australia) |
| Coastline length | 7,892 km (4,904 mi) of island coastline |
| Total land area | 2.5 million km2 (970 thousand sq mi) |
| Population | 2.965 million (as of June 2024) |
| Climate | Tropical, desert, and Mediterranean |
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What You'll Learn
- The Indian Ocean borders Western Australia to the north and west
- The Southern Ocean is south of Western Australia
- The International Hydrographic Organization designates this as the Indian Ocean
- The coastline of Western Australia is rugged and dangerous
- The Southern Ocean is also known as the Antarctic Ocean
The Indian Ocean borders Western Australia to the north and west
The Kimberley region, in the far north of Western Australia, is a multisectioned plateau with the Fitzroy and Ord rivers delineating its southern and eastern borders. Below the Kimberley region are the Victoria Plains tropical savanna and the semi-desert Pilbara shrublands. The coastal areas of Western Australia showcase the Southwest Australia savanna and the Swan Coastal Plain, which surrounds Perth, the state capital.
The Indian Ocean, bordering Western Australia, is part of Australia's maritime territories. Australia has certain sovereign rights and jurisdiction over its Territorial Seas, allowing it to govern the natural resources and manage the water column, seabed, and subsoil in these areas. The Indian Ocean is not the only ocean bordering Australia, as the country also shares coasts with the Pacific Ocean, Southern Ocean, and other neighbouring seas.
The Southern Ocean, a designated part of the Indian Ocean by the International Hydrographic Organization (IHO), borders Western Australia to the south. The coastal regions along the Southern Ocean feature spectacular cliffs, such as those found in the Goldfields-Esperance region, and unique ecosystems like the Nullarbor Plain, which extends to the state's eastern border with South Australia and the Northern Territory.
The Indian Ocean's presence along Western Australia's northern and western coasts significantly influences the region's climate and ecology. The state experiences a diverse range of climates, including tropical conditions in the Kimberley region, Mediterranean climates along the southwestern and southern coastal areas, and desert conditions in the interior regions.
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The Southern Ocean is south of Western Australia
Australia's oceans include the Pacific, Southern, and Indian Oceans, as well as the Timor, Tasman, and Coral Seas. Western Australia, the westernmost state of Australia, is bounded by the Indian Ocean to the north and west. The Southern Ocean, also known as the Antarctic Ocean, lies to the south of the continent and is officially gazetted as such in Australia. The International Hydrographic Organization (IHO), however, designates this body of water as part of the Indian Ocean.
The Southern Ocean, which borders the south of Western Australia, is a significant body of water with a rich history and unique characteristics. It surrounds Antarctica and extends northward to the 60-degree south latitude, encompassing a vast area of the global ocean. The ocean plays a crucial role in the Earth's climate system, influencing weather patterns and facilitating heat and energy exchange between the Southern Hemisphere and the rest of the planet.
The Southern Ocean is known for its strong winds and massive ocean currents, which play a crucial role in driving global ocean circulation. These currents, including the Antarctic Circumpolar Current, the strongest current in the world, help distribute heat and nutrients throughout the ocean. The Southern Ocean is also home to an abundance of unique and diverse marine life, including penguins, seals, and whales, as well as numerous species of fish and invertebrates.
The Southern Ocean holds scientific and ecological importance, with researchers studying its role in climate change and the impact of human activities on its delicate ecosystem. It is a vital region for understanding global climate patterns and the health of the world's oceans. Additionally, the Southern Ocean has a significant impact on the local climate of Western Australia, influencing the weather patterns and coastal conditions experienced by the region's residents and ecosystems.
The Southern Ocean is also associated with historical exploration and scientific discovery. Early explorers braved its treacherous waters and strong currents to expand their knowledge of the world. Today, it continues to be a site of scientific research and exploration, with ongoing efforts to study and protect its unique environment.
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The International Hydrographic Organization designates this as the Indian Ocean
Australia's western coastline is bordered by the Indian Ocean. Western Australia, the westernmost state of Australia, is bounded by the Indian Ocean to the north and west. The International Hydrographic Organization (IHO) designates the body of water south of the continent as part of the Indian Ocean. This body of water is officially gazetted in Australia as the Southern Ocean.
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering approximately 20% of the water on Earth's surface. It extends approximately 10,000 kilometres (6,200 miles) between Africa's southern coast and Australia's southern coast and reaches a width of 7,500 kilometres (4,700 miles) between southern tips of Africa and Asia. The ocean's northern boundary reaches the southern coast of Asia, where the Gulf of Aden connects the ocean with the Red Sea.
The Indian Ocean features a diverse range of physical conditions, including coastal plains, rugged coastlines, and tropical and subtropical island groups. The ocean's western coasts are generally steep and mountainous, while the eastern coasts are typically low-lying and feature large river deltas, such as the Ganges-Brahmaputra in the north and the Indus and Zambezi in the south. The Indian Ocean is also known for its diverse marine life, including coral reefs, mangroves, seagrass beds, and marine species such as whales, dolphins, and sea turtles.
The ocean plays a crucial role in the economies of the surrounding regions, including Western Australia. It provides abundant natural resources, such as fisheries and mineral deposits, and facilitates international trade through major shipping routes. The ocean's influence extends beyond the economic realm, as it also shapes the cultural and historical identities of the bordering regions.
The designation of the body of water south of the continent as part of the Indian Ocean by the International Hydrographic Organization reflects the organisation's expertise and authority in the field of marine geography and cartography. The IHO is responsible for setting standards and providing guidance on the limits of oceans and seas, ensuring a consistent and internationally recognised framework for maritime regions.
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The coastline of Western Australia is rugged and dangerous
Western Australia is bounded by the Indian Ocean to the west and north, and the Southern Ocean to the south. The coastline of Western Australia is rugged and dangerous, with strong currents and tidal ranges that can reach 39 feet (12 metres). The landscape is characterised by broad plateaus articulated by several mountain ranges, with the Kimberley region in the far north being a multisectioned plateau. The coastline features spectacular rock formations composed of solid granite, such as the Gap and the Natural Bridge in Torndirrup National Park. The diverse geology of the region gives rise to a variety of coastal features, including beaches, cliffs, and the sandstone gorges of the Kimberley on the northern coast.
The Western Australian coastline boasts the greatest diversity of seagrasses globally, with vast meadows formed by these seagrasses. The coastline is approximately 12,889 kilometres long, including islands, and constitutes a significant portion of Australia's total coastline. The earliest full charting of this coastline occurred during exploration in the late eighteenth and early nineteenth centuries.
The coastal regions of Western Australia are divided into several sections, including the North Coast (Pilbara/Kimberley), Gascoyne Coast, West Coast, and South Coast. The North Coast extends from the border of Western Australia and the Northern Territory to the west of the Ashburton River Mouth. The Gascoyne Coast begins at the Ashburton River Mouth and continues halfway between Kalbarri and Denham.
The West Coast starts halfway between Kalbarri and Denham, extending to Black Point east of Cape Leeuwin. This section includes the Turquoise Coast and the Sunset Coast, showcasing the vibrant colours of the region. The South Coast then spans from Black Point to the border with South Australia, incorporating the coastal region between Cape Leeuwin and Windy Harbour.
The coastline of Western Australia supports various industries, including fishing, pearling, boat building, and tourism. The dramatic landscapes, diverse ecosystems, and rugged beauty attract visitors from around the world. The open spaces and breathtaking views along the coast provide a refreshing escape from the dense forests and confined areas inland.
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The Southern Ocean is also known as the Antarctic Ocean
The Southern Ocean, also known as the Antarctic Ocean, is one of the five principal oceanic divisions on Earth. It is the second smallest of these five divisions, larger than the Arctic Ocean but smaller than the Pacific, Atlantic, and Indian Oceans. The Southern Ocean was recognised as a distinct ocean basin by the National Geographic Society in 2021, though other authorities had formalised it earlier.
The Southern Ocean is the only ocean that flows uninterrupted by land around the globe, encircling Antarctica like a moat. It was formed around 34 million years ago when Antarctica and South America drifted apart, creating the Drake Passage. This makes it the youngest ocean basin on Earth. The Southern Ocean plays an important role in the circulation of water around the globe, connecting different water basins across the global ocean. Its better-known northern counterpart is the Atlantic meridional overturning circulation (AMOC).
The Southern Ocean is known for its strong winds, intense storms, dramatic seasonal changes, and cold temperatures. Each winter, the Southern Ocean freezes into a fringe of sea ice, almost doubling the size of Antarctica. Antarctica's winter sea ice covers around 11 million miles (18 million square kilometres), or roughly twice the size of the United States of America.
The Southern Ocean is home to a diverse range of wildlife, including the crocodile icefish (family Channichthyidae), also known as white-blooded fish, which are found only in the Southern Ocean. The Antarctic toothfish and the Patagonian toothfish are two species that live on the seafloor 100-3,000 metres deep and can grow to around 2 metres long, weighing up to 100 kilograms.
In Australia, the body of water south of the continent is officially gazetted as the Southern Ocean, while the International Hydrographic Organization (IHO) designates it as part of the Indian Ocean. Western Australia, the westernmost state of Australia, is bounded by the Indian Ocean to the north and west and the Southern Ocean to the south.
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Frequently asked questions
The Indian Ocean borders Australia's western coastline.
The body of water south of Australia is officially gazetted as the Southern Ocean, although the International Hydrographic Organization (IHO) designates it as part of the Indian Ocean.
Australia shares a coastline with the Indian Ocean.
The capital of Western Australia is Perth.
As of June 2024, Western Australia had a population of 2.965 million people.
