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.

Within the broadest scale, Australia is a major part of the Australasia biogeographic realm, as developed by the World Wide Fund for Nature. Based on this system, the world is also split into 14 terrestrial habitats, also called biomes, of which eight are shared by Australia. The Australian land mass is divided into 89 bioregions and 419 subregions. Each region is a land area made up of a group of interacting ecosystems that are repeated in similar form across the landscape.

IBRA is updated periodically based on new data, mapping improvements, and review of the existing scheme. The most recent version is IBRA7, developed during 2012, which replaced IBRA6.1.

IBRA regions and subregions This is a list of region and subregions under IBRA7. Region codes are given in parentheses, followed by area, where known. Images of regions are from IBRA6.1, pending creation of maps for IBRA7.

A IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaArnhem Coast ARC NT Murgenella ARC01 Maningrida ARC02 Nhulunbuy ARC03 Groote ARC04 Wessels ARC05 Arnhem Plateau ARP NT Alligator ARP01 Mainoru ARP02 Australian Alps AUA NSW, VIC Snowy Mountains AUA01 Victorian Alps AUA02 Avon Wheatbelt AVW WA Merredin AVW01 Katanning AVW02

B IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaBen Lomond BEL TAS Ben Lomond (subregion) BEL01Brigalow Belt North BBN QLD Townsville Plains BBN01 Bogie River Hills BBN02 Cape River Hills BBN03 Beucazon Hills BBN04 Wyarra Hills BBN05 Northern Bowen Basin BBN06 Belyando Downs BBN07 Upper Belyando Floodout BBN08 Anakie Inlier BBN09 Basalt Downs BBN10 Isaac-Comet Downs BBN11 Nebo-Connors Ranges BBN12 South Drummond Basin BBN13 Marlborough Plains BBN14 Brigalow Belt South BBS QLD / NSW Claude River Downs BBS01 Woorabinda BBS02 Boomer Range BBS03 Mount Morgan Ranges BBS04 Callide Creek Downs BBS05 Arcadia BBS06 Dawson River Downs BBS07 Banana-Auburn Ranges BBS08 Buckland Basalts BBS09 Carnarvon Ranges BBS10 Taroom Downs BBS11 Southern Downs BBS12 Barakula BBS13 Dulacca Downs BBS14 Weribone High BBS15 Tara Downs BBS16 Eastern Darling Downs BBS17 Inglewood Sandstones BBS18 Moonie-Commoron Floodout BBS19 Moonie-Barwon Interfluve BBS20 Northern Basalts BBS21 Northern Outwash BBS22 Pilliga Outwash BBS23 Pilliga BBS24 Liverpool Plains BBS25 Liverpool Range BBS26 Talbragar Valley BBS27 Narrandool BBS28 Broken Hill Complex BHC SA / NSW Barrier Range BHC01 Mootwingee Downs BHC02 Scopes Range BHC03 Barrier Range Outwash BHC04 Bimbowrie BHC05 Curnamona BHC06 Burt Plain BRT NT Yuendumu BRT01 Atartinga BRT02 Mount Chapple BRT03 Dulcie BRT04

C IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaCape York Peninsula CYP QLD Coen - Yambo Inlier CYP01 Starke Coastal Lowlands CYP02 Cape York - Torres Strait CYP03 Jardine - Pascoe Sandstones CYP04 Battle Camp Sandstones CYP05 Laura Lowlands CYP06 Weipa Plateau CYP07 (Northern) Holroyd Plain CYP08 Coastal Plains CYP09 Carnarvon CAR WA Cape Range CAR01 Wooramel CAR02 Central Arnhem CEA NT Wilton CEA01 Parson CEA02 Central Kimberley CEK WA Pentecost CEK01 Hart CEK02 Mount Eliza (Kimberley) CEK03 Central Mackay Coast CMC QLD Whitsunday CMC01 Proserpine - Sarina Lowlands CMC02 Clarke - Connors Ranges CMC03 Byfield CMC04 Manifold CMC05 Debella CMC06 Central Ranges CER WA, NT, SA Mann-Musgrave Block CER01 Wataru CER02 Everard Block CER03 Channel Country CHC NT, QLD, NSW, SA Toko Plains CHC01 Sturt Stony Desert CHC02 Goneaway Tablelands CHC03 Diamantina-Eyre CHC04 Cooper-Diamantina Plains CHC05 Coongie CHC06 Lake Pure CHC07 Noccundra Slopes CHC08 Tibooburra Downs CHC09 Core Ranges CHC10 Bulloo CHC11 Bulloo Dunefields CHC12 Central Depression CHC13 Cobar Peneplain COP NSW Boorindal Plains COP1 Barnato Downs COP2 Canbelego Downs COP3 Nymagee COP4 Lachlan Plains COP5 Coolgardie COO WA Mardabilla COO1 Southern Cross COO2 Eastern Goldfields COO3 Coral Sea COS

D IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaDaly Basin DAB NT Daly Basin DAB01Dampierland DAL WA Fitzroy Trough DAL01 Pindanland DAL02 Darling Riverine Plains DRP QLD / NSW Culgoa-Bokhara DRP01 Warrambool-Moonie DRP02 Castlereagh-Barwon DRP03 Bogan-Macquarie DRP04 Louth Plains DRP05 Wilcannia Plains DRP06 Menindee DRP07 Great Darling Anabranch DRP08 Pooncarie-Darling DRP09 Darwin Coastal DAC NT Darwin Coastal DAC01Davenport Murchison Ranges DMR NT Ashburton Range DMR01 Davenport DMR02 Barkly DMR03 Desert Uplands DEU QLD Prairie-Torrens Creeks Alluvials DEU01 Alice Tableland DEU02 Cape-Campaspe Plains DEU03 Jericho DEU04

E IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaEinasleigh Uplands EIU QLD Georgetown - Croydon EIU01 Kidston EIU02 Hodgkinson Basin EIU03 Broken River EIU04 Undara - Toomba Basalts EIU05 Herberton - Wairuna EIU06 Esperance Plains ESP WA Fitzgerald ESP01 Recherche ESP02 Eyre Yorke Block EYB SA Southern Yorke EYB01 St Vincent EYB02 Eyre Hills EYB03 Talia EYB04 Eyre Mallee EYB05

F IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaFinke FIN NT / SA Henbury FIN01 Finke River FIN02 Tieyon FIN03 Pedirka FIN04 Flinders Lofty Block FLB SA / NSW Mount Lofty Ranges FLB01 Broughton FLB02 Olary Spur FLB02 Southern Flinders FLB04 Northern Flinders FLB05 Central Flinders FLB06 Furneaux FUR TAS / VIC Wilsons Promontory FUR01 Flinders FUR02

G IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaGascoyne GAS WA Ashburton GAS01 Carnegie GAS02 Augustus GAS03 Gawler GAW SA Myall Plains GAW01 Gawler Volcanics GAW02 Gawler Lakes GAW03 Arcoona Plateau GAW04 Kingoonya GAW05 Torrens GAW06 Roxby GAW07 Commonwealth Hill GAW08 Geraldton Sandplains GES WA Geraldton Hills GES01 Leseur Sandplain GES02 Gibson Desert GID WA Lateritic Plain GID01 Dune Field GID02 Great Sandy Desert GSD NT / WA McLarty GSD01 Mackay GSD02 Ehrenberg GSD03 Amedeus GSD04 Lake Bennett GSD05 Lake Lewis GSD06 Great Victoria Desert GVD SA / WA Shield GVD01 Central GVD02 Maralinga GVD03 Kintore GVD04 Tallaringa GVD05 Yellabinna GVD06 Gulf Coastal GUC NT Limmen GUC01 Pellews GUC02 Gulf Fall and Uplands GFU NT / QLD McArthur GFU01 Nicholson GFU02 Gulf Plains GUP NT / QLD Karumba Plains GUP01 Armraynald Plains GUP02 Woondoola Plains GUP03 Mitchell-Gilbert Fans GUP04 Claraville Plains GUP05 Holroyd Plain-Red Plateau GUP06 Doomadgee Plains GUP07 Donors Plateau GUP08 Gilberton Plateau GUP09 Wellesley Islands GUP10

H IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaHampton HAM SA, WA Hampton HAM01

I IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaIndian Tropical Islands ITI Christmas Island ITI01 Cocos Islands ITI02 Timor Sea Coral Islands ITI03

J IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaJarrah Forest JAF WA Northern Jarrah Forest JAF01 Southern Jarrah Forest JAF02

K IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaKanmantoo KAN SA Kangaroo Island KAN01 Fleurieu KAN02 King KIN TAS King KIN01

L IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaLittle Sandy Desert LSD WA Rudall LSD01 Trainor LSD02

M IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaMacDonnell Ranges MAC NT McDonnell MAC01 Watarrka MAC02 Hartz Range MAC03 Mallee MAL WA Eastern Mallee MAL01 Western Mallee MAL02 Mitchell Grass Downs MGD NT / QLD Sylvester MGD01 Barkly Tableland MGD02 Georgina Limestone MGD03 Southwestern Downs MGD04 Kynuna Plateau MGD05 Northern Downs MGD06 Central Downs MGD07 Southern Wooded Downs MGD08 Mount Isa Inlier MII QLD Southwestern Plateaus and Floodouts MII01 Thorntonia MII02 Mount Isa MII03 Mulga Lands MUL NSW / QLD West Balonne Plains MUL01 Eastern Mulga Plains MUL02 Nebine Plains, Block Range MUL03 North Eastern Plains MUL04 Warrego Plains MUL05 Langlo Plains MUL06 Cuttaburra-Paroo MUL07 West Warrego MUL08 Northern Uplands MUL09 West Bulloo MUL10 Urisino Sandplains MUL11 Warrego Sands MUL12 Kerribree Basin MUL13 White Cliffs Plateau MUL14 Paroo Overflow MUL15 Paroo-Darling Sands MUL16 Murchison MUR WA Eastern Murchison MUR01 Western Murchison MUR02 Murray Darling Depression MDD NSW, SA, VIC South Olary Plain MDD01 Murray Mallee MDD02 Murray Lakes and Coorong MDD03 Lowan Mallee MDD04 Wimmera MDD05 Darling Depression MDD06 Braemer MDD07

N IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaNandewar NAN NSW / QLD Nandewar Northern Complex NAN01 Inverell Basalts NAN02 Kaputar NAN03 Peel NAN04 Naracoorte Coastal Plain NCP SA / VIC Bridgewater NCP01 Glenelg Plain NCP02 Lucindale NCP03 Tintinara NCP04 New England Tablelands NET NSW Bundarra Downs NET01 Beardy River Hills NET02 Walcha Plateau NET03 Armidale Plateau NET04 Wongwibinda Plateau NET05 Deepwater Downs NET06 Glenn Innes-Guyra Basalts NET07 Ebor Basalts NET08 Moredun Volcanics NET09 Severn River Volcanics NET10 Northeast Forest Lands NET11 Tenterfield Plateau NET12 Yarrowyck-Kentucky Downs NET13 Binghi Plateau NET14 Stanthorpe Plateau NET15 Eastern Nandewars NET16 Tingha Plateau NET17 Nightcap NET18 Round Mountain NET19 Northern Kimberley NOK WA Mitchell NOK01 Berkeley NOK02 NSW North Coast NNC NSW Washpool NNC01 Cataract NNC02 Dalmorton NNC03 Chaelundi NNC04 Yuraygir NNC05 Coffs Coast and Escarpment NNC06 Macleay Hastings NNC07 Carrai Plateau NNC08 Macleay Gorges NNC09 Upper Manning NNC10 Comboyne Plateau NNC11 Mummel Escarpment NNC12 Barrington NNC13 Tomalla NNC14 Ellerston NNC15 Upper Hunter NNC16 Karuah Manning NNC17 Rocky River Gorge NNC18 Guy Fawkes NNC19 NSW South Western Slopes NSS NSW / VIC Inland Slopes NSS01 Lower Slopes NSS02 Capertee Valley NSS03 Nullarbor NUL SA / WA Carlisle NUL01 Nullarbor Plain NUL02 Yalata NUL03

O IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaOrd Victoria Plain OVP NT / WA Purnululu OVP01 South Kimberley Interzone OVP02 Gregory OVP03 Camfield OVP04

P IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaPacific Subtropical Islands PSI Lord Howe Island PSI01 Norfolk Island PSI02 Pine Creek PCK NT Pine Creek PCK01Pilbara PIL WA Chichester PIL01 Fortescue PIL02 Hamersley PIL03 Roebourne PIL04

R IBRA regions and subregions: IBRA7IBRA region / subregionIBRA codeAreaStates Location in AustraliaRiverina RIV NSW, SA, VIC Lachlan RIV01 Murrumbidgee RIV02 Murray Fans RIV03 Victorian Riverina RIV04 Robinvale Plains RIV05 Murray Scroll Belt RIV06

S