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The national road through the Þjórsár Valley goes over the bridge that spans the Fossá River. Shortly below, the paved road goes to one of the best known stopping places in the valley of the Þjórsá River: Hjálparfossi. There the Fossá tumbles over the edge of the lava in two separate branches, falling deep into a beautiful vegetated hollow in the columnar basalt cliffs by the waterfall.

The columnar basalt was likely formed rather quickly with a cascade of water from the Þjórsá Valley lava when it flowed around Gjáin and down into the valley about 4000 years ago.

The place name Hjálp (Help) applies to the vegetated area east of the Fossá a little below the Hjálparfoss Falls.