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- when the tidal range is between 2 metres and 4 metres (6'6¾" and 13'1½").
* Macro-tidal - when the tidal range is higher than 4 metres (13'1½").

In addition, a handful of coastal systems where the range is greater than 6m have been classed as hypertidal.

See also

* King tide, an informal term for an especially high spring tide

References

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