Green Lake is one of two tiny crater lakes on

Raoul Island Raoul Island (''Sunday Island'') is the largest and northernmost of the main Kermadec Islands, south south-west of 'Ata Island of Tonga and north north-east of New Zealand's North Island. It has been the source of vigorous volcanic activity ...

in the

Kermadec Islands The Kermadec Islands ( mi, Rangitāhua) are a subtropical island arc in the South Pacific Ocean northeast of New Zealand's North Island, and a similar distance southwest of Tonga. The islands are part of New Zealand. They are in total are ...

, the other being Blue Lake. It covers an area of about 0.15 km². It erupted on 17 March 2006, killing Department of Conservation worker Mark Kearney, who was measuring the lake's temperature.

See also