
A fire ring is a construction or device used to contain campfires and prevent them from spreading and turning into wildfires. A fire ring is designed to contain a fire that is built directly upon the ground, such as a campfire. Fire rings have no bottom, and are simply circles made of forged metal, stones, concrete, etc. which surround and contain...
Found on
http://en.wikipedia.org/wiki/Fire_ring

Circle of rocks or metal ring used to contain a fire. A proper fire ring is constructed to prevent the spread of fire above and below ground level. You should only use fire rings found in designated sites.
Found on
http://www.americantrails.org/
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