Seymour Narrows
Treacherous currents, swirling eddies, and turbulent tide-rips still harass vessels despite the blasting away in 1958 of the twin peaks of Ripple Rock. Charted in 1792 by Captain George Vancouver, the Narrows has claimed numerous ships and lives and is considered by many seamen the worst hazard to marine navigation on the British Columbia coast.
From BC's Stops of Interest