An existing barrier, man-made or natural, that will stop or slow an oncoming wildland fire.
A natural or constructed barrier used to stop or check fires that may occur, or to provide a control line from which to work.
any natural or constructed barrier to prevent fire spread (e.g. roads, streams or plowed lines).
Plowed or cleared land that has been cleaned of combustible material such as dry brush, to stop the spread of a fire.
An unplanted strip left between plantations, or on their margins, which is kept clear of flammable vegetation in the early years.
An open, clear area maintained through ground cover such as grass, brush, and trees to prevent the spread of fire.