epa04673663 Low tide reveals vast expanses of sea-bed around the Mont Saint-Michel, in France, 21 March 2015. This year, a rare confluence of astronomical factors is prompting what some in France have called the 'Tide of the Century,' and driving tourists to the bay of Mont-Saint-Michel at even high numbers than usual. Water levels are expected to reach 13.45 metres high, higher than a four-story building, at approximately 7:45 a.m. and 8 p.m. on 21 March and 8:30 a.m. and 8:50 p.m. on 22 March 2015. Due to its location, Mont-Saint-Michel is one of the places most vividly affected by the tides in all of Europe. The ocean will completely cover a low bridge that connects the promontory to the mainland 2 kilometres away. EPA/IAN LANGSDON