Sultaniye Thermal and Mineral Springs It is operated by Caunoses in 100 B. C. Ruins of this afterwards widen thermal spring with new additions during Bizantium period are within the lake today. It is recommended for rheumatism, nephritis, mental tiredness, skin and gynecological diseases, kidney and urethra diseases. As well as it can be reached with a short road voyage from Koycegiz, you can also reach there via motor from lake.