The lake water is sweet and comes from a natural warm underground stream more than 100 meters below the surface. In the lake the stream water mixes with the salt water. The water's temperature varies between 21 to 27 degrees Celsius, and turns the lake into a sort of spa, that is fit for swimming all year long.
Especially nice are the small fish that peck at your feet, at anyone who stands in one place for too long.
Nearby is also a cafe, not that cheap, but nice.
The entrance fee is 12 euros per person.