# Where Is the Highest Tide in the World?

> The world's highest tides surge into Canada's Bay of Fundy, where the sea can climb more than a four-story building between low and high water. Burntcoat Head in Nova Scotia holds the leading average range in NOAA's global comparison, at about 38.4...

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Published: 2026-09-01T14:23:25+00:00
Categories: Explainer, Oceans

![Hopewell_rocks_on_the_bay_of_fundy](https://www.argo.net/wp-content/uploads/2026/09/hopewell_rocks_on_the_bay_of_fundy.jpg)

The world's highest tides surge into Canada's Bay of Fundy, where the sea can climb more than a four-story building between low and high water. Burntcoat Head in Nova Scotia holds the leading average range in NOAA's global comparison, at about 38.4 feet. Spring tides deeper in the Minas Basin can reach roughly 50 feet under favorable conditions.

The Moon supplies the repeating pull, but geography provides the extraordinary amplification. The [NOAA ranking of tidal ranges](https://oceanservice.noaa.gov/facts/highesttide.html) places several Bay of Fundy sites at the top. The bay's long, narrowing form and the timing of its natural slosh work with the incoming Atlantic tide, concentrating water as it travels inland.

## Bay of Fundy has the highest average tidal range

**Tidal range** means the vertical difference between high water and low water. It should not be confused with the height of a single high tide above a chart reference. At Burntcoat Head, the mean range is about 38.4 feet, according to NOAA's station comparison. Nearby Horton Bluff averages about 38.1 feet, showing that the record belongs to a wider system rather than one isolated pool.

The most dramatic values occur during spring tides, when the Sun and Moon line up with Earth and their gravitational effects reinforce each other. NOAA educational material reports spring ranges up to about 50.5 feet in the **Minas Basin**. Local weather can add or subtract water, so a particular day's observed level may depart from the astronomical prediction.

Canada's [tide and current service](https://www.canada.ca/en/environment-climate-change/services/water-overview/quantity/monitoring/survey/data-products-services/tides-currents.html) publishes predictions for coastal stations. The tables matter because broad record figures do not tell visitors when a mudflat will flood or a harbor will empty. Each location follows its own timing and the incoming water can move quickly through constricted channels.

## The bay amplifies an Atlantic wave

An ocean tide is a very long wave, far longer than an ordinary wind wave. When it enters shallow coastal water, the seafloor and shoreline alter its speed and height. The Gulf of Maine first modifies the Atlantic tide. The Bay of Fundy then narrows and becomes shallower toward its upper reaches, squeezing a large volume into progressively less space.

Funneling explains part of the increase. The stronger effect involves **resonance**, the same principle that makes water slosh more strongly when a container is moved at its natural rhythm. A basin has a preferred period determined largely by its length and depth. The travel time for Fundy's oscillation is close enough to the roughly 12.4-hour lunar tidal cycle for successive tides to reinforce the motion.

NOAA's detailed [guide to tides and tidal datums](https://tidesandcurrents.noaa.gov/publications/Understanding_Tides_by_Steacy_finalFINAL11_30.pdf) describes this amplification as the Atlantic tide drives the Gulf of Maine and Bay of Fundy. Friction prevents unlimited growth, while bends and side basins distribute energy unevenly. The result is a complex moving wave rather than a bathtub filling evenly from one end.

The [National Ocean Service tide tutorial](https://oceanservice.noaa.gov/education/tutorial_currents/02tidal2.html) also shows why coastal shape is central. A tidal crest can arrive at one place while another part of the bay is already falling. River flow, winds and air pressure further modify the level recorded by a gauge.

## Large tides do not simply follow latitude

Many places with high ranges lie in Canada, Alaska and northern Europe, which can make latitude look like the cause. Comparable southern latitudes do not show the same pattern. The arrangement of continents, shelves and bays determines whether a tidal wave spreads out, loses energy or becomes concentrated.

Near Anchorage, Alaska, average ranges approach 30 feet. Turnagain Arm and Knik Arm are narrow branches of Cook Inlet, another setting where geometry concentrates the tide. NOAA lists Sunrise in Turnagain Arm at a mean range near 30.3 feet and Anchorage in Knik Arm near 26.2 feet. The values are exceptional for the United States, though still below Fundy's leading stations.

Maine has the largest normal ranges on the U.S. East Coast. Eastport and Cobscook Bay can approach 20 feet because they sit within the broader Gulf of Maine system. Farther south, ranges generally become smaller. The pattern reflects the way the Atlantic wave interacts with the continental shelf and individual embayments.

Other famous macrotidal regions include the Severn Estuary and Bristol Channel in Britain, Mont-Saint-Michel Bay in France and parts of the Argentine coast. The [Encyclopaedia Britannica overview of tides](https://www.britannica.com/science/tide) explains how local coastal configuration can magnify or diminish the astronomical forcing. No single rule based on distance from the equator predicts the outcome.

## Why record tides require local caution

A huge vertical range exposes broad mudflats at low water and floods them hours later. Channels shift, currents accelerate and cliffs may become cut off. People exploring the shore need local tide tables and enough time to return before the route closes. A record figure is useful context, but the predicted time and height at the nearest station govern a safe visit.

Ships face a related problem. Water depth changes rapidly, while strong currents complicate docking and passage through narrow channels. Ports schedule movements around sufficient under-keel clearance and manageable flow. Fishers and aquaculture operators likewise work within a coast that alternates between exposed seabed and deep water twice in most lunar days.

The tides also sustain productive habitats. Moving water carries nutrients through salt marshes and mudflats, while the exposed bottom feeds shorebirds. Organisms living there tolerate repeated changes in temperature, salinity and water cover. Fundy's record is therefore more than a striking number: it is the physical pulse organizing an entire coastal ecosystem.

Scientists keep the measurement language precise. **Mean tidal range**, maximum spring range and storm-driven water level describe different quantities. Burntcoat Head leads the standard comparison, while individual events depend on the lunar phase and weather. The world's highest tide belongs to Bay of Fundy because several mechanisms align there and their combined effect repeats with remarkable regularity.

## The tidal calendar changes the daily maximum

The Moon circles Earth in an elliptical orbit, so its distance changes. Solar alignment also shifts continuously. **Perigean spring tides** occur when a spring tide falls near the Moon's closest approach, often producing a larger predicted range than an ordinary spring tide. Coastal geometry remains the amplifier, while astronomy changes the strength of the input.

Neap tides arrive near the first and third quarter Moon, when solar and lunar tidal forces partly offset each other. Fundy's range remains large by global standards, but the difference between high and low is reduced. Tide tables express these cycles as specific heights rather than relying on a Moon-phase rule alone.

Storm surge can coincide with any tidal phase. Onshore winds and low pressure may push observed water above the prediction, raising flood risk near high tide. Offshore winds can reduce the level. Separating the **predicted astronomical tide** from the weather residual helps forecasters explain why a measured peak exceeded or missed the table.

Record comparisons also depend on consistent averaging periods and datums. A station's mean range is calculated from many observed highs and lows, whereas a tourist photograph may capture a particularly large spring event. Using the same definition across sites prevents a rare storm-assisted level from displacing the coast that sustains the largest astronomical range.

In the Bay of Fundy, the daily transformation remains visible even outside record conditions. Fishing boats can rest on the bottom at low water and float beside a high wharf hours later. The repeating exposure of the **intertidal zone** supplies a direct visual scale for an oscillation whose energy began as a long Atlantic wave.

**Related reading:** [spring tides and neap tides](https://www.argo.net/spring-tide-vs-neap-tide-what-is-the-difference/) and [ebb, flood and slack water](https://www.argo.net/ebb-flood-and-slack-water-how-tidal-currents-change/).

 **Explore this topic:** [How Many High Tides Occur Each Day?](https://www.argo.net/how-many-high-tides-occur-each-day/) and [How Many High Tides Occur Each Day?](https://www.argo.net/how-many-high-tides-occur-each-day/).