The superlative of "most powerful" comes from its water flow multiplied by its fall distance.

In Icelandic, the name derives from detta ("fall" or "collapse") and foss ("waterfalls").

Tourist access

Dettifoss is served on its west side by Route 862, a tarmac road built in 2011. Road 862 gives access to Dettifoss in all seasons more and less, while an older gravel road (Route 864) serves the east side and is usually passable in summer

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