A tidal bore is caused where a swiftly flowing river meets the incoming tide, the result being that a high
crested wave is formed. An instance of a bore is seen in the River Severn, and a modified form is also met
with in the estuary of the Humber. A funnel-shaped opening compresses the wave as it moves onward and
makes it higher. The highest bore is met with where two tidal waves meet, as in the Bay of Fundy.
