Pomorie Lake produces roughly 3,000 tons of sea salt annually using a method unchanged since Thracian settlers first channeled Black Sea water into shallow evaporation basins more than two millennia ago. The lake itself is a hypersaline lagoon separated from the sea by a narrow sand spit, its salinity reaching 28 parts per thousand in summer — nearly twice that of open seawater. When brine concentration peaks, the basin floor accumulates a thick layer of black sulfuric mud, prized since antiquity for its mineral density and used in modern balneotherapy clinics across Bulgaria. The northern shore of Pomorie Lake hosts a free-access public bathing zone where visitors coat themselves in the dark, odorous mud and wade into shallow lye pools to let the mineral slurry dry under the sun. The tradition draws both Bulgarian families and international visitors seeking relief from joint inflammation, skin conditions, and respiratory ailments. Dermatological studies conducted at Burgas Medical University between 2018 and 2023 documented measurable improvement in psoriasis and eczema symptoms following repeated mud applications, attributing the effect to sulfur compounds, magnesium salts, and trace elements including iodine and bromine. Salt production at Pomorie follows a cascade system: seawater enters the outer basins in early spring, evaporates through the summer months, and crystallizes into coarse gray salt by September. Workers rake the salt into conical heaps along the dikes, where it drains and dries before being bagged for table use and industrial processing. The pans themselves form a geometric patchwork visible from the cliffs above the town — rectangular cells divided by narrow earth berms, their surfaces shifting in color from pale jade to deep rose depending on algae blooms and mineral saturation. The site operates year-round, though bathing is most comfortable between May and October when air temperatures exceed 20°C and the mud warms quickly in direct sunlight. Winter months see reduced visitor numbers but continue salt production in sheltered pans. Local folklore holds that applying Pomorie mud during a waning moon enhances its therapeutic potency, a belief unsubstantiated by clinical data but persistent among older residents. The adjacent Museum of Salt, housed in a restored 19th-century production facility, preserves wooden rakes, wicker baskets, and hand-drawn carts used by generations of salt workers before mechanization arrived in the 1950s.