Final answer:
The topography of the local shoreline and the bathymetry of the ocean floor are the primary causes of very high tidal ranges. The Bay of Fundy in Canada is an example of a location with extremely high tides.
Step-by-step explanation:
The primary causes of very high tidal ranges are the topography of the local shoreline and the bathymetry of the ocean floor. These factors can create large variations in the height of the tides.
For example, the Bay of Fundy on the east coast of Canada experiences some of the highest tidal ranges in the world, reaching up to 16.3 meters.