Over recent weeks, beachgoers have noticed large amounts of pumice washed up on Little Bay beach.
The source of the pumice is the Havre seamount, an undersea volcano that erupted 18-21 July 2012.
The volcano is located near L’Esperance and L’Havre islands at the southern end of the Kermadec Island group. The Kermadecs are around 800 km north-east of New Zealand’s North Island and a similar distance south-west of Tonga.
The eruption generated a 20,000 square kilometre pumice raft that has gradually dispersed throughout the South Pacific. Pumice from it was observed on the Great Barrier Reef earlier this year and subsequently on the NSW North Coast. It has now spread as far south as Mollymook.