Wildfires in Georgia have burned more than 39,500 acres and destroyed more than 120 homes, officials have said.

Two major fires in the south-east of the state – the Pineland Road Fire and the Highway 82 fire – prompted Georgia Governor Brian Kemp to declare a 30-day state of emergency in 91 of the state's 159 counties.

"Right now conditions are so dry that even one small spark can quickly turn into a dangerous wildfire," Georgia Forestry Commission Director Johnny Sabo said in a video statement.

Emergency officials are also battling a range of smaller blazes, reporting 32 new wildfires that consumed 50 acres on Saturday.

"We are in extreme drought conditions, and wildfire activity has already surpassed our five year average," Sabo added.