One Tree Hill also known as Maungakiekie is a 182 metre volcanic peak located in Auckland, New Zealand. It is an important memorial place for both Māori and other New Zealanders. The suburb around the base of the hill is also called One Tree Hill; it is surrounded by the suburbs of Royal Oak to the west, and clockwise, Epsom, Greenlane, Oranga, and Onehunga.
The hill's scoria cones was erupted from three craters - one is still intact and two have been breached by lava flows that rafted away part of the side of the scoria cone. Lava flowed in all directions creating lava flows that covered an area of 20 square kilometres, many towards Onehunga, making it the largest (in terms of area covered) of the Auckland volcanic field. The age or eruption is currently unknown, although it is older than 28,500 yrs as it has a mantling of volcanic ash erupted at that time from Three kings Volcano. The summit provides views across the Auckland area, and allows visitors to see both of Auckland's harbours.[