Mount Saint John (also Te Kopuke or Tikikopuke,) is one of the volcanic scoria cones in the Auckland Volcanic Field. It has a peak 126 metres above sea level and a crater around 150 m wide. It was the site of a pā, and has retained Māori earthworks from that era such as kumara pits and terracing. The age of Mt St John is currently unknown but is older than 28,500 yrs old as the scoria cone is mantled in ash from Three Kings Volcano. Mt St John is now known to be the source of the long lava flow that flows west and out into the Waitemata Harbour as Meola Reef. This flowed down an old stream valley before Mt Eden had erupted.