Although elves are more easily encountered near the North Pole, these rings in the tundra had been created by nature, which drives the thin ground layer overlying permafrost through countless freeze-thaw cycles.
:-) Quite surprisingly, I'm not the elf on the right. Frankly, I don't think I'm an elf at all. But surely elves are skilled shapeshifters. And nature's mysteries are inexplicable.
But there is some info on the Patterns