Aerial view of Saltstraumen Tidal Current near Bodø, Norway

An aerial view shows Saltstraumen, the world's strongest tidal current, near Bodo, Norway, on September 21, 2024. Powerful whirlpools swirl through Saltstraumen as tidal currents surge between the Saltenfjord and Skjerstadfjord. Every six hours, nearly 400 million cubic meters of water rush through the 3-kilometer-long, 150-meter-wide strait, reaching speeds of up to 20 knots (10 meters per second), creating one of the world's strongest tidal flows. (Photo by Manuel Romano/NurPhoto via Getty Images)