Firefighters have faced three separate moorland blazes in the space of 24 hours.
Fires have broken out at Delph, near Saddleworth, Marsden Moor in West Yorkshire and Tintwistle in Derbyshire.
Specialist wildfire units have been drafted in to help the dozens of crews currently trying to put out the flames.
Helicopters are also providing water air support to the ground crews, scooping up thousands of gallons of water from nearby reservoirs and dropping it onto the flames.
A spokesman for Greater Manchester Fire and Rescue said that two of its wildfire units have been sent to Huddersfield Road in Delph.
It also has three crews from Bury, Marple and Stalybridge currently helping crews in Tintwistle, which along with the Marsden fire which broke out on Sunday.
According to the National Trust, the Marsden Moor fire is believed to have been started by a barbecue.
The cause of the other two blazes are not yet known.
People living nearby have been urged to keep doors and windows shut: