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Tsunami
Tsunamis that enter rivers usually take the form of cnoidal bores, a series of solitons, even if they are in the form of breaking bores at the beginning. The path of a tsunami on land is sometimes not simple, governed by its inertia and by the local topography. A huge tsunami can override small hills or cross over passes and attack villages from behind. In 1611, O-ura, a small fishing village in the Sanriku district, was surprised first from mountainside by the tsunami that crossed over a pass 27 m high, then after a while, by the tsunami from the sea that came the long way around the cape.
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