Eyre Yorke Block Eyre and Yorke mallee
Kangaroos at Innes National Park on the Yorke Peninsula
Map of the Eyre Yorke Block, a.k.a. Eyre and Yorke mallee
Ecology
Realm	Australasian
Biome	Mediterranean forests, woodlands, and scrub
Borders	List Great Victoria Desert Mount Lofty woodlands Nullarbor Plains xeric shrublands Tirari-Sturt stony desert Temperate Grassland of South Australia
Geography
Area	60,195 km2 (23,241 sq mi)
Country	Australia
States	South Australia
Coordinates	33°55′S 137°37′E / 33.917°S 137.617°E / -33.917; 137.617
Conservation
Conservation status	Critical/endangered
Protected	8,816 km2 (15%)[1]

The Eyre Yorke Block, also known as the Eyre and Yorke mallee, is an interim Australian (IBRA) bioregion and a World Wildlife Fund ecoregion covering part of the Eyre Peninsula and all of Yorke Peninsula as well as land to its immediate east in South Australia.^{[2][3][4] [5] [6] [7]}

These peninsulas consist of hilly country originally covered in eucalyptus woodland. However this is good soil for farming and the woodland has mostly been cleared for agriculture now. This coast has a temperate climate with a wet winter (300mm to 600mm of rainfall per year).

The IBRA identifies five subregions of the bioregion:

• Southern Yorke – 438,470 hectares (1,083,500 acres)
• St Vincent – 1,093,789 hectares (2,702,810 acres)
• Eyre Hills – 1,172,576 hectares (2,897,500 acres)
• Talia – 1,096,175 hectares (2,708,710 acres)
• Eyre Mallee – 2,319,398 hectares (5,731,360 acres)

The original vegetation of these low hills was woodland of short trees with a shrubby undergrowth. The original woodland consisted mainly of a tea tree Melaleuca lanceolata and mallee box (Eucalyptus porosa), a mallee eucalyptus. The flora of the two peninsulas does differ, with the Eyre Peninsula flora having similarities with areas further west as well as number of endemic species, while the Yorke Peninsula has plants typical of areas to the east.

Mammals of the region include the western grey kangaroo and the southern hairy-nosed wombat, although many more (such as the tammar wallaby have become extinct on the two peninsulas since they have been cleared for farmland. Birds include the emu.

Most of the area has been cleared for farmland resulting in reduced populations and local extinction of much wildlife, especially on Yorke Peninsula. However clearance has mostly ceased now and the northern areas of Eyre Peninsula in particular still have large areas of mallee woodland while the coastal dunes remain mostly unspoilt also. Weeds, fertiliser and herbicide runoff are still threatening habitats. Protected areas include Innes National Park on Yorke Peninsula.

15.24% of the ecoregion is in protected areas. They include:^[6]

• Thackway, R and I D Cresswell (1995) An interim biogeographic regionalisation for Australia : a framework for setting priorities in the National Reserves System Cooperative Program Version 4.0 Canberra : Australian Nature Conservation Agency, Reserve Systems Unit, 1995. ISBN 0-642-21371-2

• Media related to Eyre Yorke Block at Wikimedia Commons