8. CONCLUSIONS
There are 116 hot spring manifestations with surface temperatures ranging from 40-100 °C, scattered from northern,
western and southern Thailand. They are of non-volcanic origin as inferred from isotopic relationship between δD and δ18O
but occur, manifest within volcanic, granitic and sedimentary rocks of various ages. Hot springs in northern Thailand have
been studied on the purpose to extract and utilize the geothermal energy since 1977 while hot springs in western and
southern Thailand have been preliminary studied since 1988 and 1989 respectively. Due to higher enthalpy, hot springs in