Then visit Mud Volcano. Azerbaijan’s mud volcanoes are a unique natural phenomenon. Almost 400 of the world’s 800 mud volcanoes are located in Azerbaijan, but with respect to their number, variety and activity the Azerbaijani mud volcanoes are extraordinary. Volcanic mud is rich in macro- and micro-elements and has great therapeutic effect on certain disorders of the central nervous system, as well as on some gynecological and other ailments. The mud pools contain highly effective therapeutic substances such as bromine, magnesium and iodine. Volcanic mud is also used for the manufacture of cosmetic products.