They are widely used for water-supply and irrigation. Thermal, mineral waters containing H2S, CH2, J, Br, and other microelements, will have both commercial and medical significance in future. Fresh subsurface waters are not widely-spread. Ground waters are used for water-supply and land irrigation. South-Eastern Shirvan region.
Fresh waters have no practical significance.
They are found in the form of lenses and leakage waters. Mineral and thermal waters of carbonate, sulphuretted and methane composition are widely spread. Lessercaucasian mountain-fold region. Fresh subsurface waters are occurring everywhere. Their numerous discharges are captivated and used for the populated area water-supply.