Lake Yay () is a saline lake in Kayseri Province, central Turkey. It is situated in the rural area of Develi ilçe (district). Description The lake is the biggest in the Sultan Reedy National Park. The midpoint is at about . The elevation of its surface level is at above mean seas level. It is a shallow lake with an average depth of only .

Its average surface area is about .Essay on Kayseri While it covers a much wider surface during the rainy season, its area fluctuates and it mostly dries up in the summer season.Yerturk page by Hakan Erman When at low ebb, salt is produced in the lake bed.

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