The Thames is tidal, but it's not a bore.
When the tide comes in, the Thames rises 23 feet at London Bridge, but it is a slow, gradual rise that is hardly noticeable. Some rivers, however, have a "funnel effect," and all that water becomes a wave that pours in twice a day. And when the sun and moon line up, it can be pretty impressive, with a 6 foot wave travelling up to 10 miles.
(Sorry, there are no tidal bores in the continental US.)
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