Why does Kara-Bogaz-Gol have extremely high salinity?

The Kara-Bogaz-Gol, an inlet of the Caspian Sea, experiences extremely high salinity primarily due to its shallow depth and intense rates of evaporation.12

Because the gulf is shallow—averaging only 33 feet (10 meters) in depth—the water is highly susceptible to the region's significant evaporative forces. As water evaporates, the salts remain behind and become increasingly concentrated. This process is sustained by a continuous inflow of water from the Caspian Sea, which is drawn through a narrow strait to replace the volume lost to evaporation. Consequently, while the average salinity of the Caspian Sea is approximately 12.8 parts per thousand, the salinity in the Kara-Bogaz-Gol can reach as high as 200 parts per thousand, resulting in the world's largest deposit of natural marine salts.12