1) Blaze-stopping clear spot 2) Field 3) Fireguard 1) Fireguard 2) Fire line 
A firebreak (also called a fireroad, fire line or fuel break) is a gap in vegetation or other combustible material that acts as a barrier to slow or stop the progress of a bushfire or wildfire. A firebreak may occur naturally where there is a lack of vegetation or `fuel`, such as a river, lake or canyon. Firebreaks may also be man-made, and many.....
A natural or constructed barrier used to stop or check fires that may occur, or to provide a control line from which to work.
A strip of forest or prairie land cleared or plowed to stop or prevent the spread of fire.
An existing barrier, or one constructed before a fire occurs, from which all or most flammable materials have been removed. 
A natural or constructed barrier used to stop or check fires that may occur, or to provide a control line from which to work.
[n] - a narrow field that has been cleared to check the spread of a prairie fire or forest fire
A strip of ground in the path of the fire, cleared of all vegetation to deprive the fire of fuel
fireguard noun a narrow field that has been cleared to check the spread of a prairie fire or forest fire
a strip of plowed or cleared land made to check the spread of a prairie or forest fire.