Wilderness Island is the 2.7 hectare island between the Wandle and Wrythe in Carshalton in the London Borough of Sutton. It is designated a Local Nature Reserve and a Site of Metropolitan Importance for Nature Conservation, is owned by Sutton Council and is managed by the London Wildlife Trust.
A fish pond still remains from a former public garden on the site. Other habitats are woodland, meadows and river. Trees include a black poplar, and there are birds such as the woodpecker, kingfisher and grebe. Butterflies/moths include the speckled wood, holly blue, and the rare hornet clearwing moth. The ponds are an important habitat which have a variety of wetland plants.
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The island from the seventeenth century was the site of copper mills. It was later the site of a pleasure garden.
- "Wilderness Island". London Parks and Gardens Trust. Retrieved 28 March 2014.
- "Wilderness Island". Local Nature Reserves. Natural England. 8 March 2013. Retrieved 28 March 2014.
- "Wilderness Island". London Wildlife Trust. Retrieved 28 March 2014.
- "Map of Wilderness Island". Local Nature Reserves. Natural England. Retrieved 28 March 2014.