Am Buachaille sea stack on the coast south of Sandwood Bay, Sutherland, Scotland, United Kingdom, Europe

stack sea stack weathered weathering erosion eroded coastal erosion rock geology sandstone coast sea ocean west coast sutherland bay sandwood bay cliff sea cliff cliff top john muir trust protection protected pinnacle landscape environment wave waves wave cut platform day outdoors landscapes scenics coasts coastal features nature natural world topography physical geography surface processes sea stacks stacks great britain united kingdom europe pillar pillars rock pillars scotland rock formation rock formations strata vertical