Hafragilsfoss at 27m tall 91m wide is the third of a series of waterfalls on the glacial river Jökulsá á Fjöllum (downstream of both Selfoss and Dettifoss).
Dettifoss is a 44m tall 100m wide waterfall on the Jökulsá á Fjöllum between Selfoss and Hafragilsfoss sourced by the vast Vatnajökull Glacier in North Iceland.
Selfoss is an 11m horseshoe-shaped waterfall on Jökulsá á Fjöllum River upstream from the mighty Dettifoss reached by a slight extension of the Dettifoss hike.
Urridafoss (Urriðafoss), Katlar, and Rettarfoss (Réttarfoss) are all features of the canyon Jökulsárgljúfur further downstream of waterfalls like Dettifoss.
Holmafossar (Hólmafossar) is a fairly high-volume cascade tumbling on a tributary to the Jökulsá á Fjöllum River accessed by a lightly-used 2.6km return hike.