Thermal spring feeds a warm lake! Maintains a steady temperature of 22-25 degrees / 70-77F. Sound good to you? Half fresh half salt waters. DK eyewitness travel guide says it's a great place to swim. E22 bus from Athens, share a car? Tel: 2108962239 The lake is open year round. In the winter season the hours are from 8am to 5pm. In the summer from 6:30am to 8pm.