|Etymology||From the Dutch for "Large Island"|
|Location||Gulf of Carpentaria|
|Area||2,326.1 km2 (898.1 sq mi)|
|Length||50 km (31 mi)|
|Width||60 km (37 mi)|
|Highest elevation||219 m (719 ft)|
|Highest point||Central Hill|
|Region||East Arnhem Region/|
|Largest settlement||Alyangula (pop. 966)|
|Population||2,811 (2016 census)|
|Pop. density||1.21/km2 (3.13/sq mi)|
Groote Eylandt (Anindilyakwa: Ayangkidarrba meaning "island" //) is the largest island in the Gulf of Carpentaria and the fourth largest island in Australia. It was named by the explorer Abel Tasman in 1644 and is Dutch for "Large Island" in archaic spelling. The modern Dutch spelling is Groot Eiland.
The original inhabitants of Groote Eylandt are the Anindilyakwa, an Aboriginal Australian people, who speak the Anindilyakwa language (also known as Amamalya Ayakwa). They consist of 14 clan groups which make up the two moieties on the island. The clans maintain their traditions and have strong ties with the people in the community of Numbulwar and on Bickerton Island. The island's population was 2,811 in the 2016 census.
There are four communities on Groote Eylandt. The mining company GEMCO established the township of Alyangula for its workers. The three main Aboriginal communities are Angurugu and Umbakumba, and Milyakburra on Bickerton Island. There are also a number of outstations on the island.
The Anindilyakwa Land Council is one of four land councils in the Northern Territory. It is a representative body with statutory authority under the Aboriginal Land Rights (Northern Territory) Act 1976 and has responsibilities under the Native Title Act 1993 and the Pastoral Land Act 1992.
Groote Eylandt lies about 50 km (31 mi) from the Northern Territory mainland and eastern coast of Arnhem Land, about 630 kilometres (390 mi) from Darwin, opposite Blue Mud Bay. The island measures about 50 kilometres (31 mi) from east to west and 60 kilometres (37 mi) from north to south; its area is 2,326.1 km2 (898.1 sq mi). It is generally quite low-lying, with an average height above sea level of 15 metres (49 ft), although Central Hill reaches an elevation of 219 metres (719 ft).
Groote Eylandt is part of the federal electorate of Lingiari, for which the current member is Warren Snowdon. The island is within the Northern Territory electoral division of Arnhem. The current member for Arnhem is Labor Party member Selena Uibo, whose mother is a Nunggubuyu and Anindilyakwa woman.
With Bickerton Island and a few smaller satellite islands, Groote Eylandt forms Anindilyakwa Ward of East Arnhem Region. It contains the communities of Angurugu, Alyangula, Umbakumba, Yadagba District, Uburamudja District and Sandy Hill (Groote Eylandt) and Milyakburra District (Bickerton Island).
Outside the local government subdivision is the mining company GEMCO town of Alyangula, an unincorporated territory within the Northern Region of Northern Territory.
The whole of Groote Eylandt and its surrounding waters lie within the Anindilyakwa Indigenous Protected Area. BirdLife International has classified an unnamed islet off the north-eastern coast as an important bird area because of its global importance as a roseate tern breeding site.
Until recently, the island had been open to the public only with permission, and the local Aboriginal Land Council did not encourage tourism. There is now a resort-style hotel on the island, and visitors are welcome. The island is becoming renowned for its fine Aboriginal rock art sites, arts and crafts and outstanding sport-fishing, including sailfish, marlin, tuna, Spanish mackerel, giant trevally, queenfish, and coral trout.
Groote Eylandt is part of the Arnhem Land Aboriginal Reserve. GEMCO, a South32 / Anglo American plc joint venture, operates a large manganese mine near the community of Angurugu. In operation since the early 1960s, the mine produces more than 3.8 million tonnes annually – about a quarter of the world's total.
The traditional owners of Groote Eylandt, the Anindilyakwa people, have 14 clan groups, which make up the two moieties on Groote Eylandt. The Anindilyakwa people have inhabited the island for thousands of years. The clans maintain their traditions and have strong ties with the people in the community of Numbulwar and on Bickerton Island.
In 1856, the Jurambunga tribe, a local aboriginal conglomerate would regularly pass the island.
There had been regular contact between local Aboriginal people and Macassan traders who would visit the area searching for trepang from around the early to mid-1700s. They introduced culinary delights such as tamarinds, chilli and beer. The trade continued until the Australian Government introduced the White Australia Policy in 1906.
There is still evidence of the Macassans, such as the wild tamarind trees, which the traders introduced to the area. Some Groote Eylandt settlements, such as Umbakumba, can trace their names back to Macassan origin. 
The first recorded European sighting of Groote Eylandt was in 1623, by the Dutch ship Arnhem, under Willem van Coolsteerdt. However, the relative prevalence of the hereditary Machado-Joseph Disease (MJD) in the Groote Eylandt community (a condition otherwise mainly found in the Azores) was previously suggested as evidence of early contact with Portuguese sailors. (Contact with Chinese traders has also been suggested as a cause.) Recent genetic studies showed that the Groote Eylandt families with MJD shared a haplogroup with some families from Taiwanese, Indian, and Japanese families.
The first European settlement on the island was a Christian mission established by the Church Missionary Society at Emerald River in 1921. In 1943, after a cyclone swept through the mission, CMS decided to move the settlement south of the Angurugu River. The local Anindilyakwa people called the chosen location "Mungwardinamanja". However, as it was difficult for the European missionaries to pronounce, the local Anindilyakwa men guiding them chose the name of the Angurugu River mouth "Angurrkwa", which was later Anglicised to Angurugu.
Groote Eylandt Mining Company (GEMCO) established the town of Alyangula as the residence for the mining company workers in the late 1960s.
During World War II, in 1943, the mission moved to Angurugu, as the RAAF required the use of the mission's airstrip: the ruins of the RAAF base are still evident today. Qantas used the island as a flying boat base.
Following the Aboriginal Land Rights (Northern Territory) Act 1976, Groote Eylandt was converted to Aboriginal freehold title land. In 1979, control of the island was transferred to the local Aboriginal Town Council.
On May 20, 2008, the federal government signed a deal with local Aboriginal people from Groote Eylandt to lease land to the government for 40 years. In return, the government will spend money in the community to improve housing, education, and health in the area.