The Zambezi River meanders gently across a flat plateau. The slow-moving water supports green forests amid the scrubland and attracts Africa’s legendary wildlife. But up ahead rises a column of steam, looking like the thin smoke from a campfire. As the river drifts closer, the thread grows into a sheet, and a pounding roar rises from the earth. Out of nowhere, the river plunges over 100 meters (300 feet), disappearing into a narrow gorge like a knife slash in the earth. This is Victoria Falls, considered the largest waterfall in the world.