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Tsunamis flooded medieval Geneva, Switzerland

New findings have revealed that nearly 1,500 years ago a tsunami cause massive flooding in Geneva, Switzerland.

The team analyzed a massive sediment deposit at the bottom of the lake’s easternmost corner and determined that the material had once sat above the lake and had slid all at once into the Rhône, near where the river flows into the eastern end of Lake Geneva.

The sudden splash sent a tsunami barreling down the length of the 225-square-mile (580-square-kilometer) lake toward Geneva, at the western end of the lake, the study suggests. Researchers estimate the wave was between 9 and 26 feet (3 and 8 meters) tall, depending on how quickly the rockfall occurred, which they were unable to measure.

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Story: Daniel Stone, National Geographic News | Photo: ADS/Alamy

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