This challenging five day loop is considered to be the most difficult of the established south side hikes, so only for experienced canyon hikers with basic canyoneering skills (ACA rating: 3A VI). The rappel near the river and the lack of reliable water along the Tonto Trail make this hike significantly more hazardous than other canyon trails. The Royal Arch Loop which begins and ends at the South Bass trailhead offers a top drawer canyon adventure, replete with more natural beauty than humans can absorb. For those yet to acquire off trail navigational skills and the ability to rig a rappel anchor, this hike offers about a million ways to get into serious trouble in a remote part of the Grand Canyon. nps.gov/grca/planyourvisit/upload/Royal_Arch_Loop.pdf