beautiful volcanic terrain with black volcanic rocks and turquoise water at blue lagoon geothermal spa in iceland

active alternative and atlantic atmospheric bay beach black blue conservation crystal destinations dramatic dusk energy environment environmental europe extreme famous farm frozen geologically geology geothermal grindavashy health healthcare hot ice island keflavik lagoon lake landmannalaugar landmark landscape lava medicine mineral mood natural nature ocean phenomena place polar pool power silicate sky spa spring station steam sulphur terrain thermal tranquility travel treatment volcanic water winter