gerduberg dolerite cliffs basalt rock formation, snæfellsnes, hnappadalur valley, iceland

attraction basalt basalts beautiful blue cliff cliffs columnar columns conservation countryside destination dolerit dolerite europe formation forming geological geology geometric gerduberg grass green hnappadalur iceland island landscape mountain natural nature outdoor patterns peninsula pillar rock scenery scenic sky snaefellsnes snfellsnes stack stones summer travel valley view volcanic wall west