Firefighters were called in to the Studland Heath blaze, a Site of Special Scientific Interest, earlier Tuesday evening and warned members of the public to stay away from the park.
Two Swanage fire crews were at the scene, along with a Wareham unimog and other equipment from across the county.
A brigade spokesperson told Mirror Online: “We got a call at 8:26 pm tonight from a member of the public who could see a lot of smoke coming from Studland Heath.
Crews from Swanage (two), Westbourne, Poole, Christchurch, Hamworthy and Wimborne as well as Land Rover pumps from Swanage, Poole, Hamworthy and Bere Regis, Unimog from Wareham and a water carrier also from Poole are currently present.
“About 600 square meters of heathland are well lit and our teams are working hard to install a firebreak to protect neighboring properties. “
They tweeted earlier: “We are currently facing a heather fire on #StudlandHeath
“#Dorset Strong winds bring fire and smoke, please avoid the area if possible. “
People could see the blaze from Poole, which is about five miles away.
One person wrote on Twitter: “Looks like there’s a big fire in the Purbecks in Studland. You can see it from the cliffs at Southbourne. “
Another tweeted: “It looks like a huge fire. “
In 2010, four acres of forest in Studland Heath were destroyed by a fire of the same magnitude.