Svartifoss, Iceland

Photograph by Giacomo Ciangottini

Svartifoss (Black Fall) is surrounded by the dark lava columns that gave rise to its name. The hexagonal columns were formed inside a lava flow that cooled extremely slowly, giving rise to crystallization. Skaftafell National Park, Iceland.

(This photo and caption were submitted to the 2012 National Geographic Traveler Photo Contest.)