The Jökulsá á Fjöllum rises at Kverkfjöll from hot springs under Vatnajökull, its heat forming an ice cave before the water flows north to the sea via Jökulsárgljúfur National Park. Some daylight penetrates a few metres into the cave, but visibility rapidly diminishes in the thick, damp fog that fills it. The walls and roof are sculpted by constantly dripping water, and the debris embedded in the ice gives a marbled effect. Be warned, however, that entering ice caves is always dangerous, due to the possibility of cave-ins.
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