The Bay of Fundy (or Fundy Bay) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the US state of Maine. It has an extremely high tidal range.
Portions of the Bay of Fundy, Shepody Bay and Minas Basin, form one of six Canadian sites in the Western Hemisphere Shorebird Reserve Network, and are classified as a Hemispheric site.
The Bay of Fundy has a high tidal range. Oceanographers attribute it to tidal resonance resulting from a coincidence of timing: the time it takes a large wave to go from the mouth of the bay to the inner shore and back is practically the same as the time from one high tide to the next. During the 12.4-hour tidal period, 115 billion tonnes of water flow in and out of the bay.
According to the Canadian Hydrographic Service there is a 16.8-metre (55-foot) tidal range in Leaf Basin for Ungava Bay and 17 meters (56 feet) at Burntcoat Head for the Bay of Fundy.