Visitors can see the falls from many vantage points: above from a helicopter or microlight fixed wing plane, at eye level walking across the Knife Edge Bridge that spans the width of the falls on the Zambian side, or from below on a hike.
Tony Tyler, IATA's director general and CEO, argues that the industry is "balancing on a knife edge" with even the sturdiest and more established airlines feeling the pressure.
CNN: Europe's airline industry on 'knife edge,' says IATA boss
Until the 1997 general election, this seat was on a knife-edge between the Tories and the Liberal Democrats.
This process is used to maintain the edge between sharpenings and prevents premature dulling of the knife.
It takes strength and skill to maintain this balance, on the knife-edge between insanity and a merely fearful sanity, for over two hours.
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With the match on a knife-edge, Evans had a late attempt at a drop-goal to put Quins into the semi-finals, but his effort was wide of the posts.
With the match on a knife-edge, Evans had a late attempt at a drop-goal to put Quins into the semi-finals - but his effort was wide of the posts.
Using beams of electrons, he carved a cantilever out of the edge of each crystal (think of a knife held down on a table, with the blade sticking out).
Recent Zambian elections teetered on a knife-edge when the opposition won there, before President Rupiah Banda gracefully accepted defeat rather than cry foul.
Run a long, sharp knife around the edge of the cake and invert it onto a small rack, then invert it again onto a second rack so that the cake is right side up to complete cooling, 30 minutes more.
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"It's so on a knife's edge with the tires that it's good and it's great for racing, " he said.
But Sharma's dismissal - harshly adjudged lbw to Ben Hilfenhaus (4-57) by umpire Ian Gould to a ball that would have missed leg stump - left the match on a knife-edge with India on 205-9.
Parra's long-range 50-metre shot after 65 minutes hitting the post was a brief relief as Jauzion broke through moments later to set up a drop-goal attempt Trinh-Duc missed to leave the game on a knife-edge.
Rovers got back into the match when Cockayne profited from a Paul Cooke up-and-under to crash over and as conditions deteriorated the match remained on a knife-edge before Sheriffe ran KR out of town.
Yet, as an ugly and at times violent election season nears its end, the outcome is now on a knife-edge.
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Opinion polls had suggested the election was poised on a knife-edge.
She met the great and the good on equal terms, but she knew something of what it meant to be working class, and of how those families stood on a knife-edge between survival and precipitation into the street and the workhouse.
With counting under way in the north, the party's ambitions are on a knife edge after a dramatic night of results.
Failure to act could hasten a grave escalation in a war that has put the entire Middle East on a knife's edge.
The closest comparison may be Sacha Baron Cohen's knife-edge satirical rubes.
The evening show, inspired by the dark and twisted fairytales of the brothers Grimm, is a 45-minute, adrenaline-raising performance with a lot of knife throwing, motorcycle stunts and daredevil high-wire feats to keep you on the edge of your seat.
The vote was a relief for Tony Blair and Labour's NEC, who expected a knife-edge result.
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