Wallumatta Nature Reserve, also called the Macquarie Hospital Bushland, is a 6-hectare (15-acre) nature reserve bushland area, surrounded by the residential suburb of East Ryde, in suburban Sydney, Australia. Once part of the Field of Mars of 1804, the reserve is the largest surviving area of Sydney Turpentine-Ironbark Forest, an endangered ecosystem. Soils are based on Ashfield Shale and Hawkesbu