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The geothermal seawater literally comes from the depths of the earth. It originates 2,000 metres below the surface of the earth. Here, seawater and groundwater meet to create geothermal seawater. Pressure causes this water to flow to the earth’s surface, taking with it substances that it passes through – like silica, algae and minerals. These are what give the Blue Lagoon its rejuvenating powers.