National Geographic Travelのインスタグラム(natgeotravel) - 9月11日 05時58分

The Blue Lagoon Geothermal #spa in #Iceland. Why does the water look blue ?? The geothermal water has a unique composition, featuring three active ingredients – Silica, Algae & Minerals. The blue color comes from the silica and the way it reflects sunlight. The water is actually white. If you pour it into a transparent cup, it will always have a milky white color. The sun simply makes it look blue! Photo by Mike Theiss @ExtremeNature

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