Introduction 

 

Mosi-oa-Tunya is the name used by the local people and Victoria Falls is the later name given by Europeans. Although Victoria Falls constitute neither the highest nor the widest waterfall in the world, the claim it is the largest is based on a width of 1.7 kilometres (1 mi) and height of 108 meters (3 60 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 slotlike chasm, connected to a long series of gorges. Few other waterfalls allow such a close approach on foot. Many of Africa's animals and birds can be seen in the immediate vicinity of Victoria Falls, and the continent's range of river fish is also well represented in the Zambezi, enabling wildlife viewing and sport fishing to be combined with sightseeing.

Victoria Falls are one of Africa's major tourist attractions, and are a UNESCO World Heritage Site. The falls are shared between Zambia and Zimbabwe, and each country has a national park to protect them and a town serving as a tourism centre: Mosi-oa-Tunya National Park and Livingstone in Zambia, and Victoria Falls National Park and the town of Victoria Falls in Zimbabwe. (Latitude/longitude -17.925292 25.857611).

 

Physical Features 

 

For a considerable distance above the falls, 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 chasm 60–120 metres (200–400 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. The only outlet to the First Gorge is a 110-metre-wide (360 ft) gap about two-thirds of the way across the width of the falls from the western end, through which the whole volume of the river pours into the Victoria Falls gorges.

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 (or Cataract 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. The main streams are named, in order from Zimbabwe (west) to Zambia (east): Leaping Water (called Devil's Cataract by some), Main Falls, Rainbow Falls (the highest) and the Eastern Cataract.

 

 

The recent geological history of Victoria Falls can be seen in the form of the gorges below the falls. The basalt plateau over which the Upper Zambezi flows has many large cracks filled with weaker sandstone. In the area of the current falls the largest cracks run roughly east to west (some run nearly north-east to south-west), with smaller north-south cracks connecting them. Over at least 100,000 years, the falls have been receding upstream through the Batoka Gorges, eroding the sandstone-filled cracks to form the gorges.

 

The river's course in the current vicinity of the falls is north to south, so it opens up the large east-west cracks across its full width, then it cuts back through a short north-south crack to the next east-west one. The river has fallen in different eras into different chasms which now form a series of sharply zig-zagging gorges downstream from the falls. Ignoring some dry sections, the Second to Fifth and the Songwe Gorges each represents a past site of the falls at a time when they fell into one long straight chasm as they do now.

 

Their sizes indicate that we are not living in the age of the widest ever Mosi-oa-Tunya. The falls have already started cutting back the next major gorge, at the dip in one side of the "Leaping Waters" (also known as "Devil's Cataract") section of the falls. This is not actually a north-south crack, but a large east-north-east line of weakness across the river, and that is where the next full width falls will eventually form.

 

 

Nature Parks
The two national parks at the falls are relatively small — Mosi-oa-Tunya National Park is 66 square kilometres (16,309 acres) and Victoria Falls National Park is 23 square kilometres (5,683 acres). However, next to the latter on the southern bank is the Zambezi National Park, extending 40 kilometers (25 mi) west along the river.
 
Animals can move between the two Zimbabwean parks and can also reach Matetsi Safari Area, Kazuma Pan National Park and Hwange National Park to the south. On the Zambian side, fences and the outskirts of Livingstone tend to confine most animals to the Mosi-oa-Tunya National Park. In addition fences put up by lodges in response to crime restrict animal movement.
 
Vegetation
Mopane woodland savannah predominates in the area, with smaller areas of Miombo and Rhodesian Teak woodland and scrubland savannah. Riverine forest with palm trees lines the banks and islands above the falls.
 
The most notable aspect of the area's vegetation though is the rainforest nurtured by the spray from the falls, containing plants rare for the area such as pod mahogany, ebony, ivory palm, wild date palm and a number of creepers and lianas. Vegetation has suffered in recent droughts, and so have the animals that depend on it, particularly antelope. 

 

Wildlife
The national parks contain abundant wildlife including sizable populations of elephant, buffalo, giraffe, zebra, and a variety of antelope. Lion and leopard are only occasionally seen. Vervet monkeys and baboons are common. The river above the falls contains large populations of hippopotamus and crocodile. Elephants cross the river in the dry season at particular crossing points.

Klipspringers and clawless otters can be glimpsed in the gorges, but they are mainly known for 35 species of raptors. The Taita Falcon, Black Eagle, Peregrine Falcon and Augur Buzzard breed there. Above the falls, herons, Fish Eagles and numerous kinds of waterfowl are common.