The Wonderboom Nature Reserve (Afrikaans: Wonderboom-natuurreservaat) is a 1 km², 200-hectare reserve that incorporates a section of the Magaliesberg range in the northern portion of the Pretoria metropole, South Africa. Its main attractions are the Wonderboom (Afrikaans for "Marvel tree") near the reserve entrance in Lavender street and the derelict Fort Wonderboompoort on the crest of the Magaliesberg, that was constructed towards the end of the nineteenth century, during the Second Boer War. The latter is reached by following the steep, paved walkway that leads from the picnic area to the summit. The vicinity of the fort ruins also afford sweeping views of the city, whose council declared the area around the Wonderboom and both banks of the Apies River a reserve on 28 December 1949.