Green Hill (also Matanginui or Greenmount) is one of the volcanoes in the Auckland Volcanic Field. It's scoria cone had a peak 78 metres above sea level (around 48 m higher than the surrounding land), and had a grove of Karaka trees. The hill was the site of a pā. It was quarried from 1870 onwards, and has been mostly quarried away. The site is now Greenmount landfill. Green Hill and nearby Otara Hill were together referred to as Bessy Bell and Mary Gray after an old Scottish ballad.