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Dellen, two connected lakes in the Swedish province of Hälsingland, are appreciated among fly-fishermen for their unique population of salmon trout. This 15-km-wide lake system was formed approximately 110 million years ago, as the result of a meteorite impact.

Dellen, two connected lakes in the Swedish province of Hälsingland, are appreciated among fly-fishermen for their unique population of salmon trout. This 15-km-wide lake system was formed approximately 110 million years ago, as the result of a meteorite impact. (M 39650)