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Dettifoss is a waterfall in Vatnajökull National Park in Northeast Iceland, and is reputed to be the most powerful waterfall in Europe. The water comes from the nearby Vatnajökull glacier, whose sediment-rich runoff colors the water a greyish white. The superlative of "most powerful" comes from its water flow times its fall distance. The water of the wide Jökulsá á Fjöllum river falls for more than 144 feet, causing a massive, crashing spray.