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From high up on the rim of an old volcano, this view shows the amazing blue-green water of a lake at the bottom of the Stóra...
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Stóra-Viti Crater in Krafla, Iceland

Krafla, Iceland

From high up on the rim of an old volcano, this view shows the amazing blue-green water of a lake at the bottom of the Stóra-Viti crater. This explosion crater was formed in 1724 in the Krafla area, a region full of geothermal activity. Photo © copyright by Rob Greebon.