Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Ton Nga Chang Hot Spring and Waterfall is a natural thermal site in Rattaphum district of Songkhla Province in the deep south of Thailand, set within the Ton Nga Chang Wildlife Sanctuary — a protected rainforest named for the elephant-tusk-shaped waterfalls that cascade through primary forest before meeting the thermal spring complex below. The sulfated mineral waters provide therapeutic soaking in a jungle setting of remarkable biodiversity, where hornbills, gibbons, and Malayan tapirs inhabit the dense tropical forest surrounding the thermal pools. The southern Thai location near the Malaysian border gives the site a distinctive cultural atmosphere influenced by Malay Muslim traditions, traditional Thai-Malay cuisine, and the languid, tropical pace of life characteristic of Thailand's southern peninsula.
Insider tip — Ton Nga Chang — named after a twin waterfall said to resemble elephant tusks — is a wildlife sanctuary in Songkhla province in southern Thailand where hot springs emerge within the protected rainforest. The geothermal activity here sits along the Sumatera-Malay tectonic zone that extends south toward Peninsular Malaysia. The surrounding forest shelters gibbons, hornbills, and wild elephants. The combination of thermal bathing and wildlife spotting in a working sanctuary makes this one of southern Thailand's most memorable natural sites.