Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water. It is located in Turkey's Inner Aegean region, in the River Menderes valley, which has a temperate climate for most of the year.

The ancient Greco-Roman and Byzantine city of Hierapolis was built on top of the white "castle" which is in total about 2,700 meters (8,860 ft) long, 600 m (1,970 ft) wide and 160 m (525 ft) high. It can be seen from the hills on the opposite side of the valley in the town of Denizli, 20 km away.

Tourism is and has been a major industry. People have bathed in its pools for thousands of years. As recently as the mid-20th century, hotels were built over the ruins of Hierapolis, causing considerable damage. An approach road was built from the valley over the terraces, and motor bikes were allowed to go up and down the slopes. When the area was declared a World Heritage Site, the hotels were demolished and the road removed and replaced with artificial pools. Wearing shoes in the water is prohibited to protect the deposits.

Pamukkale's terraces are made of travertine, a sedimentary rock deposited by water from the hot springs. In this area, there are 17 hot water springs in which the temperature ranges from 35 °C (95 °F) to 100 °C (212 °F). The water that emerges from the spring is transported 320 meters (1,050 ft) to the head of the travertine terraces and deposits calcium carbonate on a section 60 to 70 meters (200 to 230 ft) long covering an expanse of 24 meters (79 ft) to 30 meters (98 ft). When the water, supersaturated with calcium carbonate, reaches the surface, carbon dioxide de-gasses from it, and calcium carbonate is deposited. The depositing continues until the carbon dioxide in the water balances the carbon dioxide in the air. Calcium carbonate is deposited by the water as a soft jelly, but this eventually hardens into travertine.

This reaction is affected by the weather conditions, ambient temperature, and the flow duration. Precipitation continues until the carbon dioxide in the thermal water reaches equilibrium with the carbon dioxide in the atmosphere. Measurements made at the source of the springs find atmospheric levels of 725 mg/l carbon dioxide, by the time this water flows across the travertines, this figure falls to 145 mg/l. Likewise calcium carbonate falls from 1200 mg/l to 400 mg/l and calcium 576.8 mg/l to 376.6 mg/l. From these results it is calculated that 499.9 mg of CaCO3 is deposited on the travertine for every liter of water. This means that for a flow rate of 1 ı/s of water 43191 grams are deposited daily. The average density of a travertine is 1.48 g/cm3 implying a deposit of 29.2 dm3. Given that the average flow of the water is 465.2 l/s this implies that it can whiten 13,584 square meters (146,220 sq ft) a day, but in practice this area coverage is difficult to attain. These theoretical calculations indicate that up to 4.9 square kilometers (1.9 sq mi) it can be covered with a white deposit of 1 millimeter (0.039 in) thickness.

Pamukkale is a tourist attraction. It is recognized as a World Heritage Site together with Hierapolis. Hierapolis-Pamukkale was made a World Heritage Site in 1988.

The underground volcanic activity which causes the hot springs also forced carbon dioxide into a cave, which was called the Plutonium meaning place of the god, Pluto. This cave was used for religious purposes by priests of Cybele, who found ways to appear immune to the suffocating gas.Tadpoles can be found in the pools.