At least 10 people killed and three million hectares of land torched across country in recent months.

A heatwave has intensified bushfires ravaging parts of Australia, and blazes surrounding Sydney worsened under “catastrophic” conditions.

Australia’s east coast has been hit by a record-breaking heatwave, which has moved in from the west of the country, exacerbating hundreds of fires in its path.

On Saturday, Sydney was shrouded in toxic smoke as blazes flared to its north, south and west, some just 130 kilometres (80 miles) from Australia’s largest city.

“We are expecting very difficult circumstances, situations, in relation to all the fire fronts,” said Gladys Berejiklian, New South Wales (NSW) premier.

“As you know, it is a catastrophic condition, which means that at short notice, any fires active can become dangerous in a short time.”

Australia endures bushfires every year but the early and intense start to this season, along with the record temperatures, has raised concerns about global warming.

Temperatures were expected to peak at 47 degrees Celsius (116 degrees Fahrenheit) in parts of the country’s most populous state, NSW, with west Sydney expected to reach 37C (98F) before a cool change is expected later in the day.

Temperatures were expected to peak at 47C (116F) in parts of New South Wales [Peter Parks/AFP]

Evacuations were being carried out in the town of Bargo, on the front of a 185,000-hectare (210,000-acre) blaze which tore through the nearby area on Thursday.

“It’s horrific, it’s devastating driving around. We feel pretty isolated where we are with the roadblocks. Loved ones can’t come and see us,” Corey Cartes, a Bargo resident, told AFP news agency.

Cartes was told to leave two days ago but has stayed behind to defend his property as the fire front on Thursday destroyed most of his fence.

“Everyone is offering to help, but there is nothing they can do. Not for us now, just stay out and stay safe and we hope the fireies [firefighters] can do their job.”

In the state of South Australia, which in the past few days has borne the brunt of the heatwave, more than 1,500 firefighters have been battling fires that ripped through more than 40,000 hectares (98,800 acres).

Two people died in fires there over the past two days, and dozens of firefighters have been treated for injuries and smoke inhalation.

At least three million hectares (7.4 million acres) of land have been torched across the country in recent months, with at least 10 people killed and more than 800 homes destroyed.