In the area of Nin, there is a site with medicinal mud (peloid) of liman type. The use of Nin peloid for health purposes has been maintained since the Roman times, and perhaps even earlier, until today, as evidenced by the findings of fragments of installations typical of Roman baths. In 1954, a mechanical analysis of the composition of peloids was performed in Nin, which revealed that it was the highest quality site in Croatia.
Such muds are formed in calm, shallow sea lagoons with a river or stream flowing into them. Thus, in the formation of liman, substances brought to the bottom by inland freshwater and the sea are deposited. There are three stages in the development of liman. In the first one, rainwater washes away the substances from the shores. These are mostly minerals and minor organic matter created by the decay of terrestrial flora and fauna. In the second marine phase, the sea floods the estuary and organic debris with a little mineral matter settles to the bottom. The Nin Saltworks was made at that stage of liman development. Liman mud areas are used for healing and are considered healthy muds because they are full of various minerals. These minerals enter the salt during its production, which is why it has a special aroma and properties. The quality of the sea and the geological base on which the saltworks is built give special features to the chemical composition of salt, and the wind and sun affect to the speed at which the salt is produced.
The Nin Saltworks was built in an area where there is healing mud that is rich in minerals and which contributes to the high quality of Nin salt.