A wildfire burning just north of Lizard Lake is now an estimated 150 hectares in size – but it could be even bigger.

The Coastal Fire Centre called the estimate “very approximate,” saying heavy smoke is making it difficult for crews to establish the fire’s boundaries.

The fire, believed to be human-caused, was reportedly moving in a north eastern direction Thursday but wasn’t immediately threatening structures, homes or communities, according to the centre.

It is currently zero per cent contained as 39 firefighters, seven helicopters, two water tenders and air tankers continue to battle the flames.

The fire is burning in woody debris on a steep hill and has also led to several spot fires, one of which is 10 hectares in size, the fire centre said.

The Pacific Marine Circle Route remains closed between Port Renfrew and Lake Cowichan and a campground at Lizard Lake has been evacuated because of the fire.

A spokeswoman said it has led to heavy smoke blanketing Lake Cowichan, located about 27 kilometres northeast of the fire.

Residents in the community tweeted pictures of the smoke and said they could smell it.

The Ministry of Environment and Island Health issued a smoky skies advisory for the region on Thursday affecting Cowichan Lake, Duncan, Crofton, Cobble Hill, Mill Bay and Shawnigan Lake.

Those with respiratory health issues are encouraged to follow some tips to minimize harm. The advisory will remain in place until further notice.

Haze seen in Victoria is likely a mix of smoke from the Lizard Lake fire as well as others burning in Washington State, according to the fire centre.