Bulgaria
The oldest salt production center in Europe (5500-4200 BC) is found at the prehistoric complex of Provadia-Solnitsata, near the town of Provadia. In 2012 Bulgaria produced 2,100,000 metric tonnes of salt, ranking 22nd in the world, accounting for 0.76 % of production. Salt pans such as the ones pictured on the 2 stotinki denomination from the "Third World Philatelic Exhibition" issue of April 15, 1974 are found in places such as Burgas' Atanasovsko Lake where the salt pans are a major tourist attraction.
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