Reynisfjara Basalt Sea Stacks
Vík í Mýrdal's enormous Basalt Sea Stacks set against the the stunning Reynisfjara Black Volcanic Sand Beach. The columnar basalt is formed when a lava flow cools suddenly and contraction forces build up. Cracks then form horizontally and the extensive fracture network that develops results in the hexagonal formation of columns which are always upright, standing perpendicular to the cooling surface.