Illilouette Fall is a 381-foot (116 m) waterfall on the Illilouette Creek tributary of the Merced River in Yosemite National Park. It is located in a small canyon that cuts into the south wall of Yosemite Valley directly across from Vernal Fall. The origin and meaning of the waterfall's name has been lost to time.The fall is prominently visible to the south from both Mist Trail and John Muir Trail... Wikipedia