An evacuation warning has been reactivated for residents in the path of a major bushfire in Western Australia's Margaret River region.
The emergency advice is for people in the Leeuwin-Naturaliste National Park, where flames have ripped through more than 6,000 hectares in the past three days.
The warning area takes in an area bound by Mammoth Cave Road to the north, Caves Road and Leeuwin-Naturaliste National Park boundary to the east, Grace Road and Bridle Trail to the south and the coast to the west in the sire of shire of Augusta-Margaret River.
Residents were told around 8:30am local time on Saturday they were in danger, needed to act immediately and that there was a threat to lives and homes.
If unable to leave safely, they were instructed to get ready to shelter in their homes by going to a room away from the fire front and making sure they could easily escape.
Firefighters had made good progress on Friday but the blaze remained uncontained.
A supplied image of the Calgardup Bushfire burning in Margaret River Source: Department of Fire and Emergency Services/AAP
Residents were also urged to leave on Thursday as more than 150 firefighters battled to strengthen containment lines in hot and windy weather.
Conditions then improved.
"We've made some very good progress overnight ... it is slightly cooler than yesterday down here in Margaret River," incident controller Brad Barton told Perth radio 6PR on Friday.
"Our priorities are to build on our containment strategies along these eastern boundaries, to tie the fire into the national park and prevent further impact out into the private property areas."
An evacuation centre remains open in Margaret River.
WA Premier Mark McGowan has been urging residents to follow official updates on the blaze.
The bushfire started near the intersection of Caves Road and Calgarup Road in Boranup, almost 300km south of Perth.
