The Interim Biogeographic Regionalisation for Australia (IBRA) is a biogeographic regionalisation of Australia developed by the Australian government's Department of Sustainability, Environment, Water, Population, and Communities. It was developed for use as a planning tool, for example for the establishment of a national reserve system. The first version of IBRA was developed in 1993–94 and published in 1995.
Gascoyne is an interim Australian bioregion located in Western Australia. It has an area of 180,752.57 square kilometres (69,788.96 sq mi). Together with Murchison bioregion to the south, it constitutes the Western Australian Mulga shrublands ecoregion, as assessed by the World Wildlife Fund.
The Northern Kimberley, an interim Australian bioregion, is located in the northern Kimberley region of Western Australia, comprising 8,420,100 hectares.
Yalgoo is an interim Australian bioregion located in Western Australia. It has an area of 5,087,577 hectares. The bioregion, together with the Avon Wheatbelt and Geraldton Sandplains bioregions, is part of the larger Southwest Australia savanna ecoregion as classified by the World Wildlife Fund.
New England Tablelands, an interim Australian bioregion, is located mainly in New South Wales, comprising 3,002,213 hectares, of which 2,860,758 hectares or 95.23 per cent of the bioregion lies within New South Wales; and the residual within Queensland. This bioregion is one of the smaller bioregions in NSW, occupying 3.57 per cent of the state.
The Mitchell Grass Downs (MGD) is an IBRA biogeographic region, located in the Northern Territory and Queensland, which comprises an area of 33,468,761 hectares with eight subregions.
Nandewar, an interim Australian bioregion, is located in New South Wales and Queensland, and comprises an area of 2,701,977 hectares, surrounded by the Brigalow Belt South to the west, south-west and north-west, and to the east by the New England Tablelands. This is a region of hills on Palaeozoic sediments and lithosols and of Eucalyptus albens woodlands and summer rainfall.
The Cape York Peninsula tropical savanna is a tropical grasslands, savannas, and shrublands ecoregion in northern Australia. It occupies the Cape York Peninsula in Queensland, mainland Australia's northernmost point. It is coterminous with the Cape York Peninsula, an interim Australian bioregion.
The Pine Creek biogeographic region, an interim Australian bioregion, is located in the Northern Territory, and comprises 2,851,777 hectares.
The Gulf Coastal, an interim Australian bioregion, is located in the Northern Territory, comprising 2,711,718 hectares.
The Gulf Fall and Uplands, an interim Australian bioregion, is located in the Northern Territory and Queensland, comprising 11,847,909 hectares.
Burt Plain, an interim Australian bioregion, is located in the Northern Territory, and comprises 7,379,719 hectares.
The Simpson Strzelecki Dunefields, an interim Australian bioregion, comprises 27,984,283 hectares, and is part of four state/territories of Australia: the Northern Territory, South Australia, New South Wales and Queensland
Mount Isa Inlier, an interim Australian bioregion, is located in the Queensland, and comprises 6,778,263 hectares.
The Pacific Subtropical Islands is an interim Australian bioregion which includes Norfolk Island and Lord Howe Island. Its IBRA code is PSI.
Central Mackay Coast, an interim Australian bioregion, is located in Queensland, and comprises 1,464,208 hectares.
Cobar Peneplain, an interim Australian bioregion, is located in New South Wales, and comprises 7,385,346 hectares.
Finke, an interim Australian bioregion, comprises 7,267,416 hectares, and is part of two state/territories of Australia: the Northern Territory and South Australia. It is part of the Central Ranges xeric scrub ecoregion.
Stony Plains, an interim Australian bioregion, comprises 13,166,372 hectares, and is part of two state/territories of Australia: the Northern Territory and South Australia.
Tanami is an interim Australian bioregion, comprising 25,997,277 hectares in the Northern Territory and Western Australia. It is part of the Great Sandy-Tanami desert ecoregion.
