Why does the Bay of Fundy move more water than all the world's rivers?
In short: The Bay of Fundy experiences the highest tidal range on Earth, moving 100 billion tonnes of water every single cycle. This massive, funnel-shaped basin creates a natural resonance that dwarfs the combined flow of every river on the planet, shaping everything from local geography to the region's unique industrial history.
The Bay of Fundy’s extreme tides, which average about 16 metres compared to a global average of one metre, are driven by tidal resonance within its funnel-shaped basin. This physical configuration forces roughly 100 billion tonnes of water in and out of the bay twice daily. These powerful currents sustain rare intertidal mudflats and unique phenomena like the Reversing Falls and the Old Sow whirlpool.
Geologically, the bay is a product of the breakup of the supercontinent Pangaea about 220 million years ago. As the land rifted, magma formed igneous structures like columnar basalt, while sedimentary basins trapped a rich record of prehistoric life. Today, the bay is a UNESCO Global Geopark, preserving fossils ranging from early reptiles in Carboniferous tree trunks to Canada’s oldest dinosaur remains.
Human history in the region is equally tied to the water. Indigenous Mi'kmaq and Passamaquoddy peoples inhabited the area for centuries before European arrival. By the 19th century, the bay had become a global shipping hub, producing the record-breaking ship Marco Polo and the largest wooden vessel ever built in Canada, the William D. Lawrence. The bay's power remains a force of nature; in 1869, the Saxby Gale created a storm surge that pushed the water level to a record 21.6 metres, breaching dykes and flooding inland communities.
Today, the bay supports diverse marine life, including endangered North Atlantic right whales, which prompted the Canadian Coast Guard to adjust shipping lanes in 2003 to prevent collisions. While the Annapolis Royal Generating Station once harnessed this tidal energy, the region remains a complex ecosystem where conservationists, such as those at the Conservation Council of New Brunswick, balance industrial activity with the protection of this rare, high-energy environment.
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- Summary by Intellect · source: Bay of Fundy
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