svartifoss, waterfall with its basalt hexagonal columns in skaftafell in the vatnajökull national park in iceland.

svartifoss hexagonal pillar pillars basalt column columns black falls duncan brown autumn waterfall water nature landscape river cascade rock stream fall waterfalls rocks flowing natural wet tourism environment beautiful flow skaftafell reserve vatnajökull national park vatnajokull tourist visitor travel attraction geological geology magnificent stunning october spray polygon pipes