A tidal bore is a natural phenomenon, which is seen in very few parts of the world. The Bay of Fundy is particularly noted for its extremely high tides, the highest in the world, and for its tidal bores.
As is generally known, the rise and fall of ocean tides is caused by the gravitational “pull” of the moon on the earth’s watery blanket.At most places along the ocean shores, high tides occur regularly every 12 hours, 25 minutes
Rafters prepare for incoming tidal bore. In the open ocean the tide only rises and falls a fraction of a meter. However, in most V-shaped bays and inlets the tide enters the broad end and the water literally “piles up” as it moves up the bay.
In certain areas, such as the Bay of Fundy, the natural period of oscillation is very, close to the tidal period and, just like water sloshing back and forth in a bowl, the rise and fall of the tide is greatly amplified.
Thus, the tide water enters the bay at its widest point, and as it passes along toward the head of the bay, it is in effect squeezed by the ever-narrowing sides and by the constant “shallowing” of the bottom.