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Lake Mývatn was formed 2300 years ago by a basaltic lava eruption which flows out of a large fissure. In earlier times, approximately 10000 years ago, it was permanently covered by an icecap. Today the area is famous for the rich fauna, expecially birdlife. Another spot is the Laxá river, which is very popular (and expensive) for salmon fishing. Brown trouts are also abundantly found in the clear river.