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Seven Natural Wonders of the World:
Victoria Falls

The Victoria Falls or Mosi-oa-Tunya (the "Smoke that Thunders") is a waterfall situated in southern Africa on the Zambezi River between the countries of Zambia and Zimbabwe. The falls are, by some measures, the most enormous waterfall in the world, as well as being among the most unusual in form, and having arguably the most diverse and easily seen wildlife of any major waterfall site.

While it is neither the highest nor the widest waterfall in the world, the claim it is the largest is based on a width of 1.7 kilometers (1 mi) and height of 108 meters (360 ft), forming the largest sheet of falling water in the world. The falls' maximum flow rate compares well with that of other major waterfalls.

The unusual form of Victoria Falls enables virtually the whole width of the falls to be viewed face-on, at the same level as the top, from as close as 60 metres (200 ft), because the whole Zambezi River drops into a deep, narrow slot-like chasm, connected to a long series of gorges. Few other waterfalls allow such a close approach on foot.

Physical Features

The Zambezi flows over a level sheet of basalt, in a shallow valley bounded by low and distant sandstone hills. The river's course is dotted with numerous tree-covered islands, which increase in number as the river approaches the falls. There are no mountains, escarpments, or deep valleys which might be expected to create a waterfall, only flat plateau extending hundreds of kilometres in all directions.

The falls are formed as the full width of the river plummets in a single vertical drop into a transverse chasm 1708 metres (5604 ft) wide, carved by its waters along a fracture zone in the basalt plateau. The depth of the chasm, called the First Gorge, varies from 80 metres (262 ft) at its western end to 108 metres (360 ft) in the centre.

There are two islands on the crest of the falls that are large enough to divide the curtain of water even at full flood: Boaruka Island near the western bank, and Livingstone Island near the middle. At less than full flood, additional islets divide the curtain of water into separate parallel streams.

Tourism

By the end of the 1990s, almost 300,000 people were visiting the falls annually, and this was expected to rise to over a million in the next decade. Unlike the game parks, Victoria Falls has more Zimbabwean and Zambian visitors than international tourists as they are accessible by bus and train and therefore comparatively inexpensive to reach.

A famous feature is a naturally formed pool known as the Devil's Swimming Pool, near the edge of the falls, accessed via Livingstone Island. When the river flow is at a safe level, usually during the months of September and December, people can swim as close as possible to the edge of the falls within the pool without continuing over the edge and falling into the gorge; this is possible due to a natural rock wall just below the water and at the very edge of the falls that stops their progress despite the current.

Reference / Image Credits:
Wikipedia
1. Island Safari
2. NY Travel Times
3. Zambia The African Safari
4. Lauren M. Childs