Keyhole Falls

Keyhole Falls, the unofficial name of the largest waterfall on British Columbia’s Lillooet River, drops about 115 feet in a punchbowl form and resembles a giant old-fashioned keyhole. It formed about 2350 years ago after a Plinian eruption at the Mount Meager massif sent breccia into the river valley and dammed the river. As water eroded through the volcanic debris, it carved the falls and unleashed a massive flood when the blockage first failed, strong enough to sweep away breccia blocks as large as small houses. Although impressive in scale, the falls are difficult to see because no developed trails reach a clear lookout and the undercut canyon edge blocks a direct view.

British Columbia · Canada