What is a tidal bore?
A tidal bore (bore
= crest or wave) is a natural phenomenon which is seen in a 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.

A tidal bore near
Chignecto Bay, New Brunswick
A
tidal bore is a wall of water that moves up certain low-lying rivers due
to an incoming tide. Tidal bores form when an incoming tide rushes up
a river, developing a steep forward slope due to resistance to the tide's
advance by the river, which is flowing in the opposite direction. Thus
we have the phenomenon of the river changing its flow before your very
eyes, flowing in OVER the outgoing river water.
The height of the
tidal bore increases with the range of the tide and may very in height
from just a ripple to several feet.

Tidal bore rafting.
Some
links for more info...
Shubenacadie
River Runners
Tidal
Bore Research Society
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