Mud bath
Look up mud bath in Wiktionary, the free dictionary.
A mud bath is a therapeutic spa treatment that involves soaking in a bath of warm mud, often in a natural hot spring or geothermal pool. Mud baths have been used for centuries as a way to promote health and relaxation, and are still popular today in many parts of the world. Mud baths can be found at spas and resorts all over the globe, from California to Italy to Japan.