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Reversing Falls Rapids is a Natural Wonder, also is the world’s greatest example of tidal impact upon a river.
Twice each day 100 billion tons of water, a volume equal to all of the world’s rivers … enters and exits the Bay of Fundy. At this location, water levels rise as much as 9 meters or 28 feet in a tidal cycle. Reversing Falls Rapids experiences two tidal cycles daily resulting in 2 low tides and 2 high tides. Each complete cycle is roughly 12 hours and 10 minutes. Between the tidal extremes is a calm period known as “slack tide”, this condition lasts for just 20 minutes and is the only time vessels can safely pass through the gorge.
Interestingly, five thousand years ago, sea level was 30 meters or 100 feet lower in this area. Native people living here at that time enjoyed an impressive waterfall! - via 