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.
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The heartland of this type of forest once covered some 26,000 hectares west to Guildford, and North of Parramatta River from Ryde to Castle Hill, as well as on the shale ridge caps in the Hornsby Plateau and into areas of the inner western suburbs.