The bubble of Strokkur, an Icelandic geyser that reaches about 25 metres when it goes for it. You might have noticed the weather wasn't especially good so there's no decent picture of it at full height, but there's this funny effect where the steam rises and pushes the water up into a dome-like bubble, before bursting with great force. I just about caught it here - these things are pretty quick and not very reliable!
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