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Sibbi and rainbow
The glacial river Jökulsá á Fjöllum, apr. 212 km long. The waterfall Dettifoss is found in this river and it is 44 m high -
Volcanic eruption
This was the first volcanic eruption. Not under the glacier so it was not dangerous. But things are quite different today -
Mirage
Fata morgana in northern Iceland. This is the first and only time I have seen this phenomen