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Depends on how the tsunami was created. By earthquake or by land slide. For example, the following tsunami no boat is safe.

https://en.wikipedia.org/wiki/Cumbre_Vieja_tsunami_hazard

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Safer than going inland..?
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There have been 70m tsunamis and lakes get tsunamis too, so… maybe?

https://en.wikipedia.org/wiki/List_of_tsunamis

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