Keyhole Falls
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Keyhole Falls is the unofficial name for the largest waterfall along the Lillooet River in British Columbia, Canada.
It is called Keyhole Falls because it resembles a giant old-fashioned keyhole.[1]
[edit] Formation
Keyhole Falls was formed when the Lillooet River was dammed with breccia from a Plinian eruption at Mount Meager about 2350 years ago. The thick breccia soon eroded from water activity, forming Keyhole Falls. There was a massive flood when the water first broke through the breccia. The flood was big enough that small house-sized blocks of breccia were carried away during the flood.[2]

