ceffyl y dwfr

"Water-horse." In Welsh folklore, a malevolent water-horse which inhabits streams and lakes. It would induce the unwary traveler to mount him, and then soaring into the clouds, or dashing over river and mountain, would suddenly melt into air or mist; and precipitate his rider into destruction.

The creature is similar to the Gaelic each uisge, the Manx cabyll-ushtey, and the Scottish kelpie.

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