The focal point in town is the small pool, formally called Lake Voulismeni, just inside the harbor. You can sit at its edge while enjoying a meal or a drink. Inevitably, it has given rise to all sorts of tales -- that it's bottomless (it's known to be about 65m/213 ft. deep); that it's connected to Santorini, the island about 104km (65 miles) to the north; and that it was the "bath of Athena." Originally it was a freshwater pool, probably fed by a subterranean river that drained water from the mountains inland. A 20th-century channel now mixes the fresh water with sea water.
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