Crater Hill

It consists of an explosion crater about 600 metres (2,000 ft) wide, partly filled with water.

The hill, alongside Māngere Lagoon, Waitomokia, Kohuora, Pukaki Lagoon and Robertson Hill, is one of the volcanic features collectively referred to as Nga Tapuwae a Mataoho ("The Sacred Footprints of Mataoho"), referring to the deity in Tāmaki Māori myths who was involved in their creation.

This lake began cooling on the surface and around the edge, creating a solid basalt crust.

When the molten lava withdrew back down the volcano's throat, the crust surface collapsed, creating the island in the middle of the present lake, and some of the solid basalt was left around the inside walls of the crater marking the former level of the lava lake.

Quarrying has removed the small scoria cone in the crater and some of the tuff ring on the northeast side.