Dalyan has many therapeutic hot springs. The waters which contain radioactive elements and sulphur are believed to cure rheumatism, skin, liver, spleen and bowel complaints, as well as being beneficial for nervous and digestive disorders. The Sultaniye Thermal Bath which is famous in Turkey, the water is 40 degrees C. The water used since Hellenistic times. The mud baths are also said to remedy rheumatism as well as cleanse and beautify skin. Once you have covered yourself in the mud, than you wait for few minutes to dry it. You clean yourself in the sulphur pool. Mud bath is also at a temperature of 40 degrees.

There are thermal springs in the south of the Koycegiz lake, at the foot of the Evlenmez mountain, and around the Dalyan stream and lake. The medium size spring is known as “Gelgirme Velibey”, the small one is known as “Riza Cavus Girmesi”. The medium-size thermal spring is preferred for its mud bath. It was newly restored and opened to tourism. This spring is famous for its beauty mud. The water boils naturally under the rocks. The warm water softens the skin and eliminates wrinkles because it contains a high ratio sulphur. Some experts claim that the mud is good for some illnes. After you have spread the mud on your body, you have to wait until it has dried. Then, you can clean your body in the pool or shower. The medium-size thermal spring is connected to the Sultaniye thermal spring which is a few hundred meters away. There’s a touristic hotel named the Sultan Hotel between the two springs.

Scenic Koycegiz Lake, located near Dalaman Airport and within convenient distance of Fethiye and Marmaris, is well known for its natural hot springs and mud baths. The lake narrows into a channel, flowing into the Dalyan river, which empties into the Mediterranean at one of Turkey’s most spectacular beaches - the breeding ground of the Caretta Caretta sea turtle. The reed-edged river meanders toward the sea, surmounted by 4th-century B.C. Lycian rock tombs. Nearby are the ruins of the ancient city of Caunos.

Situated next to a natural channel between Köycegiz Lake and the Mediterranean Sea, the Riza Cavus Thermal Baths form a water pool and a mud pond, with flow rate of about eight litres per second. The mud and mineral baths can accommodate 1,000 people per day. A second spring, Velibey Thermal Baths, is located 1.5 km north of Riza Cavus, has similar qualities and a flow rate of 20 litres per second. The Riza Cavus natural hot springs contain sodium chloride, hydrogen, sulphur bromide, fluoride, natural radioactivity (3,770 picokuri/litre =139 bekerel/litre), with a total salt and mineral content of 28 gr/lt. Temperature of the mud and water is 30 to 38 oC, and pH is about 6.5. Having very attractive physio-chemical qualities, these hot springs are good for the treatment of rheumatic, dermatological and gynaecological diseases, as well as neurological and physical exhaustion.