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The Blue Lagoon

The Blue Lagoon's large bathing area is filled with blissfully warm seawater, around 98° to 102° Fahrenheit. It's outflow from a nearby geothermal power plant, and because it's bacteria-resistant, there's no need to treat the water with chlorine. Every two days, the water is renewed, so it's frequently freshened.

Icelandic fun fact #3: One hundred percent of the electricity produced in Iceland comes from renewable sources such as geothermal and hydroelectric plants.