It doesn’t have a name, and the only easy way to access it is to float the Grand. Stop at Kanab Canyon, at mile 144, and hike in. Three miles up the canyon, there’s a huge alcove where most hikers tend to stop. Don’t. Hike a half mile up, turn right into the slot canyon that enters from the east, and walk another half mile. At the end of the canyon, you’ll find the 100-foot Whispering Falls tumbling into a 15-foot-deep swimming hole.