Victoria Falls, or Mosi-oa-Tunya ("the smoke that thunders") are one of the natural wonders of the world. Spanning the entire breadth of the Zambezi River, they are 1700 metres wide and drop over 100 metres to the gorge below, creating a thunderous noise and a mist that can be seen, and felt, at great distances. The Falls transform a wide, calm river into a ferocious torrent that flows through a series of narrow gauges below. On the Zambian side in Mosi-oa-Tunya National Park you can stand right next to the eastern cataract of the Falls and feel the full force of the water. In Victoria Falls National Park on the Zimbabwe side, you're further from the Falls but have a greater perspective. The best perspective is perhaps obtained from above though, on flights on either fixed wing aircraft, helicopters or microlights. The flow over the Falls is very dependent on the time of year - there can be a 20 fold difference between the rainy season (March to May) and the dry season (September to December), though the sheer scale of the Falls can be easier to appreciate with less volume.