Just over a decade of research went into this piece. These are the best-of-the-best ultra-distance adventure runs in the USA. I've run them all except the Four Pass Loop (which I now live the closest to). I even include the FKT times, and when I write "two of ultrarunning's hardmen," I'm talking about you Karl Meltzer and Jared Campbell. Thank you for reviving the Zion Traverse.