West of Ishigaki Island is located in the south of Okinawa Prefecture, beautiful coral has spread to Nagurawan. "Stone wall of salt", the Nagurawan offshore about 1.5 km, is salt made of 100% seawater using only seawater pumped from the sea of ??water depth about 20m. 3 days, it boiled down in the kettle, regardless of day and night, by applying its own low-temperature drying, and finished in salt aftertaste of mellow flavor.