Parts of a fire

Various parts of a fire are identified by specific names. Common terminology is important for accurate communication on the fireline. The following are commonly used terms:

Origin is where the fire started.

The head of a fire is the “running edge” of the fire, usually spreading with the greatest speed. It is driven by the wind or topography. It generally burns faster, with greater intensity and is more difficult to control. Head fires are used on prescribed burns under the right conditions. Once the fireline is established and the back and flank fires have advanced into the burn area sufficiently, head fires are often lit to complete the burn more quickly and to increase fire intensity to kill target trees and shrubs.

The rear or heel of a fire is usually opposite from the head, closest to the origin. The rear edge of the fire is usually burning slower than other sectors of the fire. It is sometimes called the heel or base of the fire.