129th meridian east

129°

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129th meridian east

In Australia the meridian nominally defines the eastern border of Western Australia with the Northern Territory and South Australia.

The meridian 129° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, Australia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole.

The 129th meridian east forms a great circle with the 51st meridian west.

In Australia, the meridian nominally defines the eastern border of Western Australia, and the western borders of the Northern Territory and South Australia.^[1] However, the border of Western Australia actually meets the Northern Territory border and South Australian border at the 26th parallel south, at what is known as Surveyor Generals Corner.^[2]

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 129th meridian east passes through:

Co-ordinates	Country, territory or sea	Notes
90°0′N 129°0′E	Arctic Ocean
77°21′N 129°0′E	Laptev Sea
73°6′N 129°0′E	Russia	Sakha Republic — islands of the Lena Delta and the mainland Amur Oblast — from 55°30′N 129°0′E
49°27′N 129°0′E	People's Republic of China	Heilongjiang Jilin — from 43°31′N 129°0′E
42°6′N 129°0′E	North Korea
40°28′N 129°0′E	Sea of Japan
37°43′N 129°0′E	South Korea	Passing just west of Busan
35°4′N 129°0′E	East China Sea	Korea Strait — passing just west of the island of Tsushima Island, Nagasaki Prefecture,  Japan (at 34°8′N 129°10′E)
32°58′N 129°0′E	Japan	Nagasaki Prefecture — islands of Nakadorijima, Wakamatsujima and Kabajima, Gotō Islands
32°44′N 129°0′E	East China Sea
28°50′N 129°0′E	Japan	Kagoshima Prefecture — islands of Kaminonejima and Yokoatejima, Tokara Islands
28°47′N 129°0′E	East China Sea
27°48′N 129°0′E	Japan	Kagoshima Prefecture — island of Tokunoshima
27°41′N 129°0′E	Pacific Ocean	Passing just east of the island of Halmahera,  Indonesia (at 0°13′N 128°54′E)
1°55′N 129°0′E	Halmahera Sea
1°20′S 129°0′E	Ceram Sea
2°49′S 129°0′E	Indonesia	Island of Seram
3°21′S 129°0′E	Banda Sea
8°12′S 129°0′E	Indonesia	Island of Sermata
8°16′S 129°0′E	Timor Sea
14°52′S 129°0′E	Australia	Western Australia / Northern Territory border Western Australia / South Australia border — from 26°0′S 129°0′E
31°41′S 129°0′E	Indian Ocean	Australian authorities consider this to be part of the Southern Ocean[3][4]
60°0′S 129°0′E	Southern Ocean
66°59′S 129°0′E	Antarctica	Australian Antarctic Territory, claimed by  Australia

See also

• 128th meridian east
• 130th meridian east

References

1. "Border Lengths - States and Territories: Western Australia - South Australia - Northern Territory border". Geoscience Australia, Government of Australia. 2021. A glance at most maps of Australia will tell you something that isn't quite true. The border which runs along the eastern edge of Western Australia is not actually one continuous straight line. [...] The [1922] agreement set out the border as being a line determined by the 129th meridian east longitude. However, the agreement required that the boundary be defined by lines running north and south [...] and in June 1968 two monuments approximately 127 metres apart were erected at the junction of the boundaries.
2. Porter, John (April 1990). AN HISTORICAL PERSPECTIVE - Longitude 129 degrees east, and why it is not the longest, straight line in the world. National Perspectives: 32nd Australian Surveyors Congress Technical Papers 31 March - 6 April 1990. Canberra: The Institution: Eyepiece - Official Organ of The Institution of Surveyors, Australia, W.A. Division. pp. 18–24. Porter.
3. Darby, Andrew (22 December 2003). "Canberra all at sea over position of Southern Ocean". The Age. Archived from the original on 25 December 2018. Retrieved 13 January 2013.
4. "Indian Ocean". Encyclopædia Britannica. Archived from the original on 25 December 2018. Retrieved 13 January 2013.