Jökulsá (yöˈkülsou) [key], name of several Icelandic rivers formed by glaciers. The best known is the Jökulsá á Fjöllum, which rises on the north slope of the Vatnajökull in SE Iceland and flows c.130 mi (210 km) N into the Axarfjörður, forming the Dettifoss c.30 mi (50 km) from its mouth.
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