From an AtlasObscura.com online article:
Having earned the superlative of “most powerful waterfall in Europe” because of its massive flow rate (3,059,112 U.S. gallons per minute), standing near this unfettered display of power will give you a healthy respect for the fury of nature.
Iceland is famous for its spectacular waterfalls, many of which are beautiful and serene places for contemplation. Dettifoss is not one of them.
The 330-foot-wide falls are fed by the river Jökulsá, which means “glacier river” in Icelandic, a reference to the Vatnajökull glacier (recipient of another superlative: one of Europe’s largest). Be careful as you approach and stick to designated pathways since even they can be rendered slippery in the mist.
To read more: https://www.atlasobscura.com/itineraries/northern-iceland-untamed-coasts?utm_source=Atlas+Obscura+Daily+Newsletter&utm_campaign=093ef32c96-EMAIL_CAMPAIGN_2019_08_21_USA_24&utm_medium=email&mc_cid=99514583bf&mc_eid=9baf474570