Australian Indian Ocean Territories in the context of "Boundaries between the continents of Earth"

Determining the boundaries between the continents is generally a matter of geographical convention and consensus. Several slightly different conventions are in use. The number of continents is most commonly considered seven (in English-speaking countries) but may range as low as four when Afro-Eurasia and the Americas are both considered as single continents. An island can be considered to be associated with a given continent by either lying on the continent's adjacent continental shelf (e.g. Singapore, the British Isles) or being a part of a microcontinent on the same principal tectonic plate (e.g. Madagascar and Seychelles). An island can also be entirely oceanic while still being associated with a continent by geology (e.g. Bermuda, the Australian Indian Ocean Territories) or by common geopolitical convention (e.g. Ascension Island, the South Sandwich Islands). Another example is the grouping into Oceania of the Pacific Islands with Australia and Zealandia.

There are three overland boundaries subject to definition:

The Straits Settlements (Malay: Negeri-Negeri Selat) were a group of British territories located in Southeast Asia. Originally established in 1826 as part of the territories controlled by the British East India Company, the Straits Settlements came under control of the British Raj in 1858 and then under direct British control as a Crown colony in 1867. In 1946, following the end of World War II and the Japanese occupation, the colony was dissolved as part of Britain's reorganisation of its Southeast Asian dependencies in the area.

The Straits Settlements originally consisted of the four individual settlements of Penang, Singapore, Malacca and Dinding. Christmas Island and the Cocos (Keeling) Islands were added in 1886. The island of Labuan, off the coast of Borneo, was also incorporated into the colony with effect from 1 January 1907, becoming a separate settlement within it in 1912. Most of the territories now form part of Malaysia, from which Singapore separated in 1965. The Cocos (Keeling) Islands and Christmas Island were transferred from Singapore to Australian control in 1955 and 1958, respectively. Their administrations were combined in 1996 to form the Australian Indian Ocean Territories.

The Cocos (Keeling) Islands (Cocos Islands Malay: Pulu Kokos [Keeling]), officially the Territory of Cocos (Keeling) Islands (/ˈkoʊkəs/; Cocos Islands Malay: Pulu Kokos [Keeling]), are an Australian external territory in the Indian Ocean, comprising a small archipelago approximately midway between Australia and Sri Lanka and relatively close to the Indonesian island of Sumatra. The territory's dual name (official since the islands' incorporation into Australia in 1955) reflects that the islands have historically been known as either the Cocos Islands or the Keeling Islands.

The territory consists of two atolls made up of 27 coral islands, of which only two – West Island and Home Island – are inhabited. The population of around 600 people consists mainly of Cocos Malays, who mostly practise Sunni Islam and speak a dialect of Malay as their first language. The territory is administered by the Australian federal government's Department of Infrastructure, Transport, Regional Development, Communications and the Arts as an Australian external territory and together with Christmas Island (which is about 960 kilometres (600 mi) to the east) forms the Australian Indian Ocean Territories administrative grouping. However, the islanders do have a degree of self-government through the local shire council. Many public services – including health, education, and policing – are provided by the state of Western Australia, and Western Australian law applies except where the federal government has determined otherwise. The territory also uses Western Australian postcodes.

The Senate is the upper house of the bicameral Parliament of Australia, the lower house being the House of Representatives.

The powers, role and composition of the Senate are set out in Chapter I of the federal constitution as well as federal legislation and constitutional convention. There are a total of 76 senators: 12 are elected from each of the six Australian states, regardless of population, and 2 each representing the Australian Capital Territory (including the Jervis Bay Territory and Norfolk Island) and the Northern Territory (including the Australian Indian Ocean Territories). Senators are popularly elected under the single transferable vote system of proportional representation in state-wide and territory-wide districts.