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Vouliagmeni Lake, 15 miles south of Athens, Vouliagmeni 16671, Greece

Natural hot springs continually fill this saltwater/mineral-water lake from below, keeping the brilliantly blue waters at a temperature of around 75 degrees year-round. A hydrotherapy center ($12 entry fee) offers treatments, and underground caves attract the occasional diver. The lake is just south of the town of Vouliagmeni, across Poseidonos Avenue from the ocean.

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Vouliagmeni Lake Hot Springs

Natural hot springs continually fill this saltwater/mineral-water lake from below, keeping the brilliantly blue waters at a temperature of around 75 degrees year-round. A hydrotherapy center ($12 entry fee) offers treatments, and underground caves attract the occasional diver. The lake is just south of the town of Vouliagmeni, across Poseidonos Avenue from the ocean.