The article describes the history of the use of mineral waters and mud peoples living in the territory and migratory Caspian. Prikaspiyskaya cavity region is spread salt dome tectonics within Caspian hydrogeological megabasin. By the salt domes are associated with the majority of the lakes are located in their territory. Pool I S receptacle different brines and saline waters. Where s is located mainly underground waters s e balneological groups thereof without "specific" components and properties and iodo x-bromine and sulfide.