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 . While it covers a much wider surface during the rainy season, its area fluctuates and it mostly dries up in the summer season. When at low ebb, salt is produced in the lake bed. References Landforms of Kayseri Province Develi District Yay Yay