Technically, you cannot walk "behind" the actual main vertical drop of Angel Falls (Kerepakupai Merú) in Venezuela because the water falls from such an immense height (979 meters) that it largely turns into mist before reaching the bottom. However, the experience of "walking behind a waterfall" in that region is usually associated with Sapo Falls (Salto El Sapo), which is located nearby in Canaima National Park. At Sapo Falls, there is a famous, exhilarating ledge trail that allows hikers to walk entirely behind the thundering curtain of water. It is a signature part of the Angel Falls tour package. For Angel Falls itself, the closest you get on foot is the "Mirador" (viewpoint) at the base of the falls after a steep jungle trek. At this point, you are often drenched by the "spray" or "rain" created by the falls, but the sheer rock face of the Auyán-tepui mountain is flat, preventing a passage behind the primary flow like you might find at Niagara or Seljalandsfoss.