Many Bioregionalists, including poet Gary Snyder, identify the central and northern Coast Ranges, Klamath-Siskiyou, the Central Valley, and Sierra Nevada as the Shasta Bioregion or the Alta California Bioregion
Three mammal families are endemic to the bioregion; the Solenodontidae includes two species of Solenodon, one species on Cuba, the other on Hispaniola.
The Hindu Kush, Karakoram, Himalaya, and Patkai ranges bound the bioregion on the northwest, north, and northeast; these ranges were formed by the collision of the northward-drifting Indian subcontinent with Asia beginning 45 million years ago.
Proposed habitats for this species are KwaZulu-Natal Highland Thornveld (Sub-Escarpment Grassland Bioregion) and Carletonville Dolomite Grassland (Dry Highvield Grassland Bioregion) in the Grassland Biome Unit.
Sydney Turpentine-Ironbark Forest, a critically endangered ecological community of indigenous plants unique to parts of the Sydney Basin bioregion, New South Wales, Australia.
The Wallumatta Nature Reserve is a small and critically endangered remnant of preserved bushland located at the corner of Twin and Cressy Roads, North Ryde, and is significant for being the largest remaining expanse of endangered Sydney Turpentine-Ironbark Forest, which is an ecological community of plants unique to the Sydney bioregion.