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Solnitsata

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Solnitsata (Bulgarian: Солницата, "The Saltworks") was a prehistoric town located in present-day Bulgaria, near the modern city of Provadia. It is the oldest salt production center in continental Europe (5500‑4200 BC). It was the first prehistoric urban center in Europe. Solnitsata was a fortified stone settlement - citadelle, inner and outer city with pottery production site and the site of a salt production facility; it flourished c. 4700–4200 BC. The settlement was walled to protect the salt, a crucial commodity in antiquity. Although its population has been estimated at only 350, Vassil Nikolov argues that it meets established criteria as a prehistoric proto-city.