Provadia-Solnitsata is a very large prehistoric complex near the modern town of Provadia in northeastern Bulgaria, close to Varna. It was established and inhabited by the earliest producers of cooking salt in Europe during the 6th and 5th millennia BC. Throughout most of late prehistory, these people held a monopoly on salt across a vast region stretching from the Danube River to the White Sea and from the Black Sea to the Central Balkans. And since without salt the life of every animal organism, as well as that of humans, is impossible, salt producers were very wealthy thanks to long-distance trade. The specialized production of table salt caused significant social changes, including a clear hierarchy in society in the region of the lower reaches of the Provadia River and the Varna Lakes, as evidenced by the Varna "golden" necropolis. In fact, according to current data, it appears that this region was the first in Europe to develop a complex prehistoric society, with Provadia-Solnitsata emerging as the first prehistoric urban center on the old continent. Therefore, this archaeological complex, covering an area of about 300 decares, is of exceptional interest for the history of early agricultural antiquity.