Besides its unique natural beauties, Dalyan is also known for its healing powers. Many famous visitors from all around the world prove this fact. There are quite a few people reporting that they got rid of lower back pain, rheumatism, and sciatica they had been complaining about for years after they swam in the thermal springs here. The most important one of these hot springs is the Sultaniye thermal springs.

Located southwest of the lake of Köyceğiz, on the skirts of the mountain of Ölmez, Sultaniye Thermal springs are 4 kilometers away from Dalyan. It is accessible by boats that leave from the port. Having the highest radioactivity (98.3) rate for hot springs in Turkey, the Sultaniye thermal springs ranks the second place in terms of Radon values worldwide following the hot springs in Indonesia. The temperature of the water is 39 degrees Celsius. It contains calcium chloride, calcium sulfate, calcium sulfide, and radon

The thermal spring water is said to be effective on curing lower back pain, rheumatism, sciatica, nephritis, skin ailments, and women's diseases. The length of the therapy is 21 days, and one needs to bathe twice a day, beginning with a 10 minutes long session. It also helps in liver, gall bladder, and colon diseases when used as drinking water.