New Brunswick

New Brunswick fronts the inner Bay of Fundy on Canada's east coast and runs the world record for tidal range. Saint John sits on the western shore of the bay at the Saint John river mouth; Burntcoat Head Park across the bay on the Nova Scotia side holds the official Guinness record at 16.3 metres of swing on the largest spring tides. The reason is hydrodynamic resonance — the natural oscillation period of the funnel-shaped Bay of Fundy basin happens to match the lunar semidiurnal forcing period closely enough that each tide reinforces the previous one, building amplitude on the way to the head of the bay where the geometry concentrates the entire mass of water into a narrow throat. Mean range at the Saint John harbour gauge is about 6.9 metres on a normal day, climbing past 8.5 metres on the largest spring tides and dropping near 5.0 on neaps. The Reversing Falls at the mouth of the Saint John river is a tidal-bore phenomenon: the rising tide overpowers the river current and pushes water upstream, then reverses direction as the tide drops. Hopewell Rocks across the bay on the New Brunswick side, the Fundy Trail Parkway, the working fishing fleet at Saint Andrews on Passamaquoddy Bay, and the Salmon Cove sand beach all read the table for different windows. Lowest spring lows expose mud flats stretching kilometres offshore. The Canadian Hydrographic Service runs the authoritative gauge network and publishes the official tide tables. Open-Meteo Marine drives the gridded predictions on this site, but for piloting in the Bay of Fundy the CHS is the authoritative source — Fundy currents are working-hazardous and can run over five knots on the change of tide.