A safety zone is a location where a threatened firefighter can find adequate refuge from an approaching [wildfire], where no fire shelter is needed. Safety Zones 1 (LCES) (Safety Zones 1 (LCES) (nwcg.gov))
Fire fighters are trained on how to identify a good safety zone. They are instructed to:

1. Consider the distance from the escaped fire as well as topography, winds, fire behavior, and fuels in the area.
2. The best locations are usually in the black, have with a minimum of, or are devoid of, ground/aerial vegetation, or are large bodies of water.
3. Location is scouted and marked well for visibility at all times.
4. Location has been reassessed in relation to line work progress, fatigue, changes in fire behavior, and arrival of additional resources.
5. For radiant heat only, the distance separation between the firefighter and the flames must be at least four times the maximum continuous flame height. This distance must be maintained on all sides if the fire has ability to burn completely around the safety zone. Convective heat from wind and/or terrain influences will increase this distance requirement.
6. Take advantage of heat barriers such as lee side of ridges, large rocks, or solid structures.