Peek-A-Boo and Spooky Gulch are slot canyons in Grand Staircase-Escalante National Monument in South Utah. Peek-a-boo Gulch has carved a narrow channel into the sandstone. Spooky Gulch is extremely narrow. Despite being over 10 m deep, the channel rarely widens to more than 0.5 m, forcing hikers to walk sideways. Its name comes from how little sunlight penetrates to the bottom of the slot. These canyons are lots of fun unless you are claustrophobic.