The “Central Iranian Sea” is a shorthand for the superposition of several inland lakes and playas at the heart of the Iranian Plateau (the Namak Lake basin, Hoz-e Soltan, Dasht-e Kavir, etc.). During the colder, wetter phases of the Quaternary these water bodies expanded; during the warmer phases of the Holocene they retreated. That gradual desiccation was not merely a physical trend—it triggered a cascade of environmental changes (soil salinization, higher evaporation, instability of surface water) that directly reshaped settlement patterns, agriculture, migration routes, and water-management innovations around the basin—most notably in the Sialk region. What was the Central Lake? (A natural “advantage” that gradually turned into a “risk”) Extensive geomorphic evidence—lake terraces, broad travertine fields, and wide pediments—shows that, at times, interconnected water bodies linked Hoz-e Soltan, Namak Lake, and the “Dry Sea of Saveh.” Three shoreline base levels at 790/800/900 m remain along the margins, marking former lake […]