Fire crews working on the massive wildfire on Chatham Island hope to have it fully out by the end of the month.
The fire broke out more than a week ago and mapping shows it burnt through 2500 hectares of vegetation before being fully contained on Tuesday.
Fire and Emergency's Principal Rural Fire Officer, Craig Cottrill, said firefighters and helicopter pilots had been working 11-hour days to ensure the blaze didn't flare up again.
Crews were using thermal imaging cameras to identify hot spots that needed to be doused with water, Mr Cottrill said.
An investigation into the cause of the blaze was underway, he said.