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Dimmuborgir, an unusual lava field at the east side of Mývatn. It was created 2300 years ago when lava from an eruption to the east flowed through a small lake causing intense boiling and leaving solidified pillars when it continued to lower grounds. A network of footpaths runs through this area, and you may spend hours here if you want to see most of it. (Dimmu-borgir means Dark-castle.)