I am a trail adopter and scatter fire rings often. There are five common sites within sight of each other. I scatter the rings in three of the sites to direct use to the two sites that are already most heavly impacted.

In a local Wilderness Area that are several fairly well developed hunter's camp off trail. I leave those intact. Not all fire rings are created equal.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra