The Bay of Fundy is a coastal basin in eastern Canada notable for large tidal ranges. Its geometry and the dynamical response of the connected bay system strongly amplify the incoming semidiurnal tide.
The important physical idea is forced motion of a basin: water depth, shape and friction determine its natural response, while the external astronomical tide supplies the drive. Large range is not a direct local measurement of an unusually strong gravitational field. Range also varies with location and the spring-neap cycle, so one quoted maximum does not characterize every observation.
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