Unusually high and low tides due to the every 18 years full-moon-perigee coöccurance, coupled with the natural topography that causes some of the most extreme tides in the world, Mont Saint-Michel in France, temporarily became both fully attached and fully detached from mainland today.
The supertide phenomenon occurs only every 18 years when several astronomical factors coincide
Crowds gathered on the causeway were pushed back by the advancing tide
Picture: AP