The anatomical parts of a forest fire are:
Bay(s) — A marked indentation in the fire perimeter, usually located between two fingers. (Synonym: Pocket(s).)

Finger(s) — An elongated burned area(s) projecting from the main body of the f re resulting in an irregular f re perimeter.

Flanks — Those portions of the fire perimeter that are between the head and the back of the fire which are roughly parallel to the main direction of spread. (Synonym: Sides.)

Head — That portion of the fire perimeter having the greatest rate of spread and frontal fire intensity which is generally on the downwind and/or upslope part of the fire.

Back — That portion of the fire perimeter opposite the head; the slowest spreading part of the fire. (Synonyms: Base, Heel, and Rear.)

Island(s) — Area(s) of unburned fuels located within the fire perimeter.

Point(s)of Origin — The location(s) within the fire perimeter where ignition first occurred. (Synonym: Origin(s) of a Fire.)