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Part of France’s North Atlantic coast and southwestern England braced for their first giant tide of the millennium on Saturday as the alignment of the Sun and Moon created an ocean surge not seen since the 1990s. This so-called « supertide » or « tide of the century » with surges up to 14 meters high, actually happens every 18 years. The high tides have turned France’s famed Mont Saint-Michel into an island, and sent bore tide waves into England’s River Severn, and the extreme low tides have exposed areas of beach and rock unseen since 1997.

An aerial view as a high tide submerges a narrow causeway leading to Mont Saint-Michel, on France’s northern coast, on March 21, 2015. # AP Photo

A group of people walk on the mud flats at low tide around the Mont Saint-Michel 11th century abbey off France’s Normandy coast on March 21, 2015. # Pascal Rossignol/Reuters

Surfers limber up as they wait to ride the wave of the tidal bore called Severn bore on the River Severn at Newnham in Gloucestershire, England, on March 21, 2015. # Geoff Caddick/AFP/Getty Images

People sit on an embankment as the incoming high tide surrounds Mont Saint-Michel, off France’s Normandy coast, on March 21, 2015. # Pascal Rossignol / Reuters