Hoff's Aliner Travels
A Travel Blog for US and Canadian Parks with Geological Notes

Reversing Falls at St John, New Brunswick

Modified from Wikipedia:
The Reversing Falls are a series of rapids on the Saint John River located in Saint John, New Brunswick, Canada, where the river runs through a narrow gorge before emptying into the Bay of Fundy.

The semidiurnal tides of the bay force the flow of water to reverse against the prevailing current at this location when the tide is high, although in the spring freshet, this is frequently surpassed by the downstream volume of water. The rapids, or “falls”, are created by a series of underwater ledges which roil the water in either direction, causing a significant navigation hazard, despite the depth of water. As a result, vessels wishing to enter or exit from the river must wait for slack tide.

Caves at St Martins


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