"It’s a toss-up whether the Narrows in Zion National Park of Buckskin Gulch in Grand Staircase-Escalante National Monument is the best nontechnical, multiday slot canyon hike in the world. Beyond debate is the fact that the Buckskin Gulch-Paria Canyon route is nearly thrice as long—meaning more time immersed in a swirling red-rock chasm at points no more than six feet (two meters) wide and 500 feet (152 meters) high."