Behind it, a cylinder, six boys in circumference and two boys deep, their limbs outstretched and frozen so they couldn’t possibly be holding on to each other.
From the start, Ender was plagued by vertigo as he walked through the tunnels, especially the ones that girdled Eros’s narrow circumference.
There are no more uses of "circumference" in the book.
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He walked quickly around its entire circumference, running his left hand along the wall as he did so.
James Dashner -- The Scorch Trials
In order to ensure that my claim would not be overlooked, I felt obliged to make a property mark on stones, clumps of moss, and patches of vegetation at intervals of not more than fifteen feet around the circumference of my claim.