Corvon was a location on Cardassia that had mineral baths and murals from the pre-Hebitian period.
In the year 2318, Dalin Dukat compared the Bajoran carvings in Naghai Keep to those of the Corvon mineral baths, but Kotan Pa'Dar said the carvings at Naghai Keep were far older. (ST - Terok Nor novel: Day of the Vipers)